diff --git a/vizro-core/docs/pages/user_guides/navigation.md b/vizro-core/docs/pages/user_guides/navigation.md
index 531368897..fcf13e2f0 100644
--- a/vizro-core/docs/pages/user_guides/navigation.md
+++ b/vizro-core/docs/pages/user_guides/navigation.md
@@ -35,7 +35,7 @@ If you want to deviate from the default title `SELECT PAGE` and instead provide
                     title="My first page",
                     components=[
                         vm.Graph(
-                            id="scatter_chart", 
+                            id="scatter_chart",
                             figure=px.scatter(iris, x="sepal_length", y="petal_width", color="species")
                         ),
                     ],
@@ -44,7 +44,7 @@ If you want to deviate from the default title `SELECT PAGE` and instead provide
                     title="My second page",
                     components=[
                         vm.Graph(
-                            id="line_chart", 
+                            id="line_chart",
                             figure=px.line(iris, x="sepal_length", y="petal_width", color="species")
                         ),
                     ],
@@ -124,7 +124,7 @@ Currently available selectors are [`NavBar`][vizro.models.NavBar] and [`Accordio
                     title="My first page",
                     components=[
                         vm.Graph(
-                            id="scatter_chart", 
+                            id="scatter_chart",
                             figure=px.scatter(iris, x="sepal_length", y="petal_width", color="species")
                         ),
                     ],
@@ -133,7 +133,7 @@ Currently available selectors are [`NavBar`][vizro.models.NavBar] and [`Accordio
                     title="My second page",
                     components=[
                         vm.Graph(
-                            id="line_chart", 
+                            id="line_chart",
                             figure=px.line(iris, x="sepal_length", y="petal_width", color="species")
                         ),
                     ],
@@ -142,7 +142,7 @@ Currently available selectors are [`NavBar`][vizro.models.NavBar] and [`Accordio
         dashboard = vm.Dashboard(
                         pages=[page_1, page_2],
                         navigation=vm.Navigation(
-                            pages=["My first page", "My second page"], 
+                            pages=["My first page", "My second page"],
                             selector=vm.NavBar()
                         )
                     )
@@ -194,7 +194,7 @@ Currently available selectors are [`NavBar`][vizro.models.NavBar] and [`Accordio
 ## Customizing Selectors
 
 ### Accordion
-To customize default accordion provide a `dict` mapping of the page group title and a list of page IDs to the `pages` argument of the [`Accordion`][vizro.models.Accordion] model. 
+To customize default accordion provide a `dict` mapping of the page group title and a list of page IDs to the `pages` argument of the [`Accordion`][vizro.models.Accordion] model.
 
    ```
     Navigation(
@@ -248,13 +248,13 @@ To customize default accordion provide a `dict` mapping of the page group title
 </table>
 
 ### NavBar
-To add navigation bar with icons to your dashboard provide [`NavBar`][vizro.models.NavBar] model to the `selector` argument of the `Navigation`. 
+To add navigation bar with icons to your dashboard provide [`NavBar`][vizro.models.NavBar] model to the `selector` argument of the `Navigation`.
 
-NavBar model has two arguments `pages` and `items`. 
+NavBar model has two arguments `pages` and `items`.
 
 - **`NavBar.pages`**
 
-Use `pages` for default icon image and configuration. 
+Use `pages` for default icon image and configuration.
    ```
     Navigation(
         selector=NavBar(pages=["My first page", "My second page"])
@@ -263,7 +263,7 @@ Use `pages` for default icon image and configuration.
 
 - **`NavBar.items`**
 
-Use `items` to add customization to the icons. `NavBar.items` is provided as list of `NavLink` models. `NavLink` model is responsible for building individual icons within navigation bar. 
+Use `items` to add customization to the icons. `NavBar.items` is provided as list of `NavLink` models. `NavLink` model is responsible for building individual icons within navigation bar.
 
 For further customizations of icons, you can refer to the [`NavLink`][vizro.models.NavLink] reference. Some popular choices are:
 
@@ -297,12 +297,12 @@ Navigation(
 <td style="width:360px">
 
     ```py
-    
+
     vm.Navigation(
         selector=vm.NavBar(
             pages={
                 "First icon": [
-                    "My first page", 
+                    "My first page",
                     "My second page"
                 ],
                 "Second icon": [
@@ -311,7 +311,7 @@ Navigation(
             }
         )
     )
-    
+
     ```
 
 </td>
@@ -326,7 +326,7 @@ Navigation(
 <td style="width:360px">
 
     ```py
-    
+
     vm.Navigation(
         selector=vm.NavBar(
             items=[
@@ -342,8 +342,8 @@ Navigation(
             ]
         )
     )
-    
+
     ```
  </td>
  </tr>
- </table>
\ No newline at end of file
+ </table>
diff --git a/vizro-core/src/vizro/_vizro.py b/vizro-core/src/vizro/_vizro.py
index f5f247ccd..3295b8d94 100644
--- a/vizro-core/src/vizro/_vizro.py
+++ b/vizro-core/src/vizro/_vizro.py
@@ -24,7 +24,8 @@ def __init__(self, **kwargs):
         """
         self.dash = dash.Dash(**kwargs, use_pages=True, pages_folder="")
         self.dash.config.external_stylesheets.append(
-            "https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined")
+            "https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined"
+        )
 
         # Include Vizro assets (in the static folder) as external scripts and stylesheets. We extend self.dash.config
         # objects so the user can specify additional external_scripts and external_stylesheets via kwargs.
diff --git a/vizro-core/src/vizro/models/_navigation/accordion.py b/vizro-core/src/vizro/models/_navigation/accordion.py
index 12895ebbb..23543e3fd 100644
--- a/vizro-core/src/vizro/models/_navigation/accordion.py
+++ b/vizro-core/src/vizro/models/_navigation/accordion.py
@@ -1,6 +1,6 @@
 import itertools
 from collections.abc import Mapping
-from typing import Dict, List, Literal, Optional
+from typing import Dict, List, Literal
 
 import dash
 import dash_bootstrap_components as dbc
diff --git a/vizro-core/src/vizro/models/_navigation/nav_bar.py b/vizro-core/src/vizro/models/_navigation/nav_bar.py
index 5d20227e7..c1a11c9a0 100644
--- a/vizro-core/src/vizro/models/_navigation/nav_bar.py
+++ b/vizro-core/src/vizro/models/_navigation/nav_bar.py
@@ -1,11 +1,10 @@
 from __future__ import annotations
-from collections.abc import Mapping
 
-import itertools
-from typing import List, Optional, cast, Literal, Dict
+from collections.abc import Mapping
+from typing import Dict, List, Literal
 
 from dash import html
-from pydantic import validator, Field
+from pydantic import Field, validator
 
 from vizro.models import VizroBaseModel
 from vizro.models._models_utils import _log_call
@@ -40,10 +39,14 @@ def coerce_pages_type(cls, pages):
 
     @_log_call
     def pre_build(self):
-        self.items = self.items or [NavLink(text=group_title, pages=pages) for group_title, pages in self.pages.items()]
+        self.items = self.items or [
+            NavLink(label=group_title, pages=pages) for group_title, pages in self.pages.items()
+        ]
 
         for position, item in enumerate(self.items, 1):
-            item.icon = item.icon or f"filter_{position}" if position <= 9 else "filter_9+"
+            # The filter icons are named filter_1, filter_2, etc. up to filter_9. If there are more than 9 items, then
+            # the 10th and all subsequent items are named filter_9+.
+            item.icon = item.icon or f"filter_{position}" if position <= 9 else "filter_9+"  # noqa: PLR2004
 
         # Since models instantiated in pre_build do not themselves have pre_build called on them, we call it manually
         # here.
diff --git a/vizro-core/src/vizro/models/_navigation/nav_item.py b/vizro-core/src/vizro/models/_navigation/nav_link.py
similarity index 95%
rename from vizro-core/src/vizro/models/_navigation/nav_item.py
rename to vizro-core/src/vizro/models/_navigation/nav_link.py
index 951797764..426158afc 100644
--- a/vizro-core/src/vizro/models/_navigation/nav_item.py
+++ b/vizro-core/src/vizro/models/_navigation/nav_link.py
@@ -1,13 +1,12 @@
 from __future__ import annotations
 
 import itertools
-import os
-from typing import Optional, Literal, Dict, List, Union
+from typing import Optional
 
 import dash
 import dash_bootstrap_components as dbc
 from dash import html
-from pydantic import Field, root_validator, validator, PrivateAttr
+from pydantic import Field, PrivateAttr, validator
 
 from vizro.models import VizroBaseModel
 from vizro.models._models_utils import _log_call
diff --git a/vizro-core/src/vizro/models/_navigation/navigation.py b/vizro-core/src/vizro/models/_navigation/navigation.py
index a506dd009..9226753f1 100644
--- a/vizro-core/src/vizro/models/_navigation/navigation.py
+++ b/vizro-core/src/vizro/models/_navigation/navigation.py
@@ -9,7 +9,6 @@
 from vizro.models._models_utils import _log_call
 from vizro.models._navigation._navigation_utils import _validate_pages
 from vizro.models._navigation.accordion import Accordion
-from vizro.models._navigation.nav_bar import NavBar
 from vizro.models.types import NavPagesType, NavSelectorType
 
 
@@ -23,7 +22,7 @@ class Navigation(VizroBaseModel):
             Defaults to `None`.
     """
 
-    pages: NavPagesType = []  # AM: yes but NavPagesType: note breaking change, maybe put whole type hint in
+    pages: NavPagesType = []  # AM: yes but NavPagesType: note breaking change, maybe put whole type ht in
     nav_selector: Optional[NavSelectorType] = None
 
     # validators
@@ -43,9 +42,9 @@ def pre_build(self):
     def build(self, *, active_page_id=None):
         nav_selector = self.nav_selector.build(active_page_id=active_page_id)
         if "nav_bar_outer" not in nav_selector:
-            # e.g. nav_selector is Accordion and nav_selector.build returns single html.Div with id="nav_panel_outer". This will
-            # make it match the case e.g. nav_selector is NavBar and nav_selector.build returns html.Div containing children
-            # with id="nav_bar_outer" and id="nav_panel_outer"
+            # e.g. nav_selector is Accordion and nav_selector.build returns single html.Div with id="nav_panel_outer".
+            # This will make it match the case e.g. nav_selector is NavBar and nav_selector.build returns html.Div
+            # containing children with id="nav_bar_outer" and id="nav_panel_outer"
             nav_selector = html.Div([html.Div(className="hidden", id="nav_bar_outer"), nav_selector])
 
         return nav_selector
diff --git a/vizro-core/tests/unit/vizro/models/_navigation/test_accordion.py b/vizro-core/tests/unit/vizro/models/_navigation/test_accordion.py
index 2d7f1d3ce..458e8bdcc 100644
--- a/vizro-core/tests/unit/vizro/models/_navigation/test_accordion.py
+++ b/vizro-core/tests/unit/vizro/models/_navigation/test_accordion.py
@@ -8,8 +8,8 @@
 from dash import html
 from pydantic import ValidationError
 
-from vizro._constants import ACCORDION_DEFAULT_TITLE
 import vizro.models as vm
+from vizro._constants import ACCORDION_DEFAULT_TITLE
 
 
 @pytest.fixture
diff --git a/vizro-core/tests/unit/vizro/models/_navigation/test_nav_bar.py b/vizro-core/tests/unit/vizro/models/_navigation/test_nav_bar.py
index cf223f777..67a1bbd19 100644
--- a/vizro-core/tests/unit/vizro/models/_navigation/test_nav_bar.py
+++ b/vizro-core/tests/unit/vizro/models/_navigation/test_nav_bar.py
@@ -22,7 +22,7 @@ def test_nav_bar_mandatory_only(self):
         assert nav_bar.items == []
 
     def test_nav_bar_mandatory_and_optional(self, pages_as_dict):
-        nav_link = vm.NavLink(label="Text")
+        nav_link = vm.NavLink(label="Label")
         nav_bar = vm.NavBar(id="nav_bar", pages=pages_as_dict, items=[nav_link])
 
         assert nav_bar.id == "nav_bar"
@@ -60,8 +60,8 @@ def test_default_items(self, pages_as_dict):
 
     def test_items_with_with_pages_icons(self, pages_as_dict):
         nav_links = [
-            vm.NavLink(label="Text", pages={"Group 1": ["Page 1"]}, icon="Home"),
-            vm.NavLink(label="Text", pages={"Group 2": ["Page 2"]}),
+            vm.NavLink(label="Label", pages={"Group 1": ["Page 1"]}, icon="Home"),
+            vm.NavLink(label="Label", pages={"Group 2": ["Page 2"]}),
         ]
         nav_bar = vm.NavBar(pages=pages_as_dict, items=nav_links)
         nav_bar.pre_build()
diff --git a/vizro-core/tests/unit/vizro/models/_navigation/test_nav_item.py b/vizro-core/tests/unit/vizro/models/_navigation/test_nav_item.py
index d1a66a458..87524e649 100644
--- a/vizro-core/tests/unit/vizro/models/_navigation/test_nav_item.py
+++ b/vizro-core/tests/unit/vizro/models/_navigation/test_nav_item.py
@@ -16,10 +16,10 @@ class TestNavLinkInstantiation:
     """Tests NavLink model instantiation."""
 
     def test_nav_link_mandatory_only(self):
-        nav_link = vm.NavLink(label="Text")
+        nav_link = vm.NavLink(label="Label")
 
         assert hasattr(nav_link, "id")
-        assert nav_link.label == "Text"
+        assert nav_link.label == "Label"
         assert nav_link.icon is None
         assert nav_link.pages == []
 
@@ -32,7 +32,7 @@ def test_nav_link_mandatory_and_optional(self, pages_as_list):
         assert nav_link.pages == pages_as_list
 
     def test_nav_link_valid_pages_as_dict(self, pages_as_dict):
-        nav_link = vm.NavLink(pages=pages_as_dict, label="Text")
+        nav_link = vm.NavLink(pages=pages_as_dict, label="Label")
         assert nav_link.pages == pages_as_dict
 
     def test_mandatory_label_missing(self):
@@ -59,7 +59,7 @@ def test_invalid_page(self, pages):
 @pytest.mark.usefixtures("vizro_app", "prebuilt_dashboard")
 class TestNavLinkPreBuildMethod:
     def test_nav_link(self, pages_as_dict):
-        nav_link = vm.NavLink(label="Text", pages=pages_as_dict)
+        nav_link = vm.NavLink(label="Label", pages=pages_as_dict)
         nav_link.pre_build()
         assert isinstance(nav_link._nav_selector, vm.Accordion)
         assert nav_link._nav_selector.pages == pages_as_dict
@@ -70,7 +70,7 @@ class TestNavLinkBuildMethod:
     """Tests NavLink model build method."""
 
     def test_nav_link_active(self, pages_as_dict):
-        nav_link = vm.NavLink(label="Text", pages=pages_as_dict)
+        nav_link = vm.NavLink(label="Label", pages=pages_as_dict)
         nav_link.pre_build()
         built_nav_link = nav_link.build(active_page_id="Page 1")
         assert isinstance(built_nav_link[nav_link.id], dbc.Button)
@@ -79,7 +79,7 @@ def test_nav_link_active(self, pages_as_dict):
         assert isinstance(built_nav_link["nav_panel_outer"], html.Div)
 
     def test_nav_link_not_active(self, pages_as_dict):
-        nav_link = vm.NavLink(label="Text", pages=pages_as_dict)
+        nav_link = vm.NavLink(label="Label", pages=pages_as_dict)
         nav_link.pre_build()
         built_nav_link = nav_link.build(active_page_id="Page 3")
         assert isinstance(built_nav_link[nav_link.id], dbc.Button)
diff --git a/vizro-core/tests/unit/vizro/models/_navigation/test_navigation.py b/vizro-core/tests/unit/vizro/models/_navigation/test_navigation.py
index 1315533c4..67750106d 100644
--- a/vizro-core/tests/unit/vizro/models/_navigation/test_navigation.py
+++ b/vizro-core/tests/unit/vizro/models/_navigation/test_navigation.py
@@ -1,14 +1,11 @@
 """Unit tests for vizro.models.Navigation."""
-import json
 import re
 
-import plotly
 import pytest
 from dash import html
 from pydantic import ValidationError
 
 import vizro.models as vm
-from vizro._constants import ACCORDION_DEFAULT_TITLE
 
 
 # AM: move to dashboard tests