diff --git a/.env.example b/.env.example
index 380f3789d..ae0b13f45 100644
--- a/.env.example
+++ b/.env.example
@@ -82,15 +82,10 @@ E2E=true
 # Deployment environment
 ENVIRONMENT=
 
+# Gov One Authentication
 GOV_ONE_LOGIN=true
-
-# Base URI for Gov One Login requests
 GOV_ONE_BASE_URI=https://oidc.integration.account.gov.uk
 
-# Redirect URIs for Gov One Login redirects
-# Replace localhost:3000 with the correct application root path
-GOV_ONE_REDIRECT_URI=http://localhost:3000/users/auth/openid_connect/callback
-GOV_ONE_LOGOUT_REDIRECT_URI=http://localhost:3000/users/sign_out
 
 # DISPLAY SERVICE_UNAVAILABLE PAGE
 MAINTENANCE = true
\ No newline at end of file
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1cea13948..919fd8ca5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -34,8 +34,6 @@ jobs:
       DOMAIN: recovery.app
       BOT_TOKEN: bot_token
       GOV_ONE_BASE_URI: https://oidc.test.account.gov.uk
-      GOV_ONE_REDIRECT_URI: https://recovery.app/users/auth/openid_connect/callback
-      GOV_ONE_LOGOUT_REDIRECT_URI: https://recovery.app/users/sign_out
 
     services:
       postgres:
diff --git a/app/helpers/gov_one_helper.rb b/app/helpers/gov_one_helper.rb
index 488e8d8fc..575622145 100644
--- a/app/helpers/gov_one_helper.rb
+++ b/app/helpers/gov_one_helper.rb
@@ -7,12 +7,12 @@ def login_uri
       client_id: Rails.application.config.gov_one_client_id,
       nonce: SecureRandom.uuid,
       state: SecureRandom.uuid,
-      redirect_uri: Rails.application.config.gov_one_redirect_uri,
+      redirect_uri: GovOneAuthService::CALLBACKS[:login],
     }
 
     session[:gov_one_auth_state] = params[:state]
 
-    gov_one_uri('authorize', params).to_s
+    gov_one_uri(:login, params).to_s
   end
 
   # @return [String]
@@ -20,19 +20,19 @@ def logout_uri
     params = {
       id_token_hint: session[:id_token],
       state: SecureRandom.uuid,
-      post_logout_redirect_uri: Rails.application.config.gov_one_logout_redirect_uri,
+      post_logout_redirect_uri: GovOneAuthService::CALLBACKS[:logout],
     }
 
-    gov_one_uri('logout', params).to_s
+    gov_one_uri(:logout, params).to_s
   end
 
 private
 
-  # @param endpoint [String]
+  # @param endpoint [Symbol]
   # @param params [Hash]
   # @return [URI::HTTP, URI::HTTPS]
   def gov_one_uri(endpoint, params)
-    uri = URI.parse("#{ENV['GOV_ONE_BASE_URI']}/#{endpoint}")
+    uri = URI.parse(GovOneAuthService::ENDPOINTS[endpoint])
     uri.query = URI.encode_www_form(params)
     uri
   end
diff --git a/app/services/gov_one_auth_service.rb b/app/services/gov_one_auth_service.rb
index 93029da85..e806fc691 100644
--- a/app/services/gov_one_auth_service.rb
+++ b/app/services/gov_one_auth_service.rb
@@ -1,22 +1,34 @@
-# Service for interacting with Gov One Login
-# This service is initialised with an authorisation code and can be used to:
+#
 # - exchange an authorisation code for tokens (access and id)
 # - exchange an access token for user info
 # - decode an id token to get the user's gov one id
 #
-# More information on the Gov One Login integration environment can be found here:
-# https://docs.sign-in.service.gov.uk/integrate-with-integration-environment/
-
+# @see https://docs.sign-in.service.gov.uk/
 class GovOneAuthService
+  # @return [Hash{Symbol => String}]
+  CALLBACKS = {
+    login: "#{Rails.application.config.service_url}/users/auth/openid_connect/callback",
+    logout: "#{Rails.application.config.service_url}/users/sign_out",
+  }.freeze
+
+  # @return [Hash{Symbol => String}]
+  ENDPOINTS = {
+    login: "#{Rails.application.config.gov_one_base_uri}/authorize",
+    logout: "#{Rails.application.config.gov_one_base_uri}/logout",
+    token: "#{Rails.application.config.gov_one_base_uri}/token",
+    userinfo: "#{Rails.application.config.gov_one_base_uri}/userinfo",
+    jwks: "#{Rails.application.config.gov_one_base_uri}/.well-known/jwks.json",
+  }.freeze
+
   extend Dry::Initializer
 
-  option :code, Types::String
+  option :code, Types::Strict::String
 
+  # POST /token
   # @return [Hash]
   def tokens
-    http = build_http(token_uri)
-
-    token_request = Net::HTTP::Post.new(token_uri.path, { 'Content-Type' => 'application/x-www-form-urlencoded' })
+    uri, http = build_http(ENDPOINTS[:token])
+    token_request = Net::HTTP::Post.new(uri.path, { 'Content-Type' => 'application/x-www-form-urlencoded' })
     token_request.set_form_data(token_body)
     token_response = http.request(token_request)
 
@@ -26,12 +38,12 @@ def tokens
     {}
   end
 
+  # GET /userinfo
   # @param access_token [String]
   # @return [Hash]
   def user_info(access_token)
-    http = build_http(userinfo_uri)
-
-    userinfo_request = Net::HTTP::Get.new(userinfo_uri.path, { 'Authorization' => "Bearer #{access_token}" })
+    uri, http = build_http(ENDPOINTS[:userinfo])
+    userinfo_request = Net::HTTP::Get.new(uri.path, { 'Authorization' => "Bearer #{access_token}" })
     userinfo_response = http.request(userinfo_request)
 
     JSON.parse(userinfo_response.body)
@@ -52,34 +64,18 @@ def decode_id_token(token)
 
 private
 
-  # @return [URI]
-  def token_uri
-    gov_one_uri('token')
-  end
-
-  # @return [URI]
-  def userinfo_uri
-    gov_one_uri('userinfo')
-  end
-
-  # @param endpoint [String]
-  # @return [URI]
-  def gov_one_uri(endpoint)
-    URI.parse("#{Rails.application.config.gov_one_base_uri}/#{endpoint}")
-  end
-
-  # @param uri [URI]
-  # @return [Net::HTTP]
-  def build_http(uri)
+  # @param address [String]
+  # @return [Array<URI::HTTP, Net::HTTP>]
+  def build_http(address)
+    uri = URI.parse(address)
     http = Net::HTTP.new(uri.host, uri.port)
     http.use_ssl = true unless Rails.env.test?
-    http
+    [uri, http]
   end
 
   # @return [Hash]
   def jwks
-    uri = gov_one_uri('.well-known/jwks.json')
-    http = build_http(uri)
+    uri, http = build_http(ENDPOINTS[:jwks])
     response = http.request(Net::HTTP::Get.new(uri.path))
     JSON.parse(response.body)
   end
@@ -89,7 +85,7 @@ def jwt_assertion
     rsa_private = OpenSSL::PKey::RSA.new(Rails.application.config.gov_one_private_key)
 
     payload = {
-      aud: token_uri.to_s,
+      aud: ENDPOINTS[:token],
       iss: Rails.application.config.gov_one_client_id,
       sub: Rails.application.config.gov_one_client_id,
       exp: Time.zone.now.to_i + 5 * 60,
@@ -105,7 +101,7 @@ def token_body
     {
       grant_type: 'authorization_code',
       code: code,
-      redirect_uri: ENV['GOV_ONE_REDIRECT_URI'],
+      redirect_uri: CALLBACKS[:login],
       client_assertion_type: 'urn:ietf:params:oauth:client-assertion-type:jwt-bearer',
       client_assertion: jwt_assertion,
     }
diff --git a/app/views/gov_one/info.html.slim b/app/views/gov_one/info.html.slim
index da7a2602f..309f98ce8 100644
--- a/app/views/gov_one/info.html.slim
+++ b/app/views/gov_one/info.html.slim
@@ -1,14 +1,14 @@
 = render 'learning/cms_debug'
 
 - content_for :page_title do
-  = html_title t('gov-one.info.title')
+  = html_title t('gov_one.title')
 
 .govuk-grid-row
   .govuk-grid-column-one-half
-    = m('gov-one-info.body')
+    = m('gov_one.body')
 
     - if current_user
-      = govuk_button_link_to t('gov-one-info.sign-out-button'), logout_uri
+      = govuk_button_link_to t('gov_one.links.sign_out'), logout_uri
     - else
-      = govuk_button_link_to t('gov-one-info.sign-in-button'), login_uri
+      = govuk_button_link_to t('gov_one.links.sign_in'), login_uri
   
\ No newline at end of file
diff --git a/config/application.rb b/config/application.rb
index 02cdc1841..62ccd629c 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -32,6 +32,8 @@ class Application < Rails::Application
     end
 
     config.service_name = 'Early years child development training'
+    config.service_url = (Rails.env.production? ? 'https://' : 'http://') + ENV.fetch('DOMAIN', 'child-development-training')
+
     config.internal_mailbox = ENV.fetch('INTERNAL_MAILBOX', 'child-development.training@education.gov.uk')
     config.middleware.use Grover::Middleware
     config.active_record.yaml_column_permitted_classes = [Symbol]
@@ -69,11 +71,9 @@ class Application < Rails::Application
     config.contentful_environment             = ENV.fetch('CONTENTFUL_ENVIRONMENT', credentials.dig(:contentful, :environment))
 
     # Gov one
-    config.gov_one_base_uri = ENV.fetch('GOV_ONE_BASE_URI', '#GOV_ONE_BASE_URI_env_var_missing')
-    config.gov_one_redirect_uri = ENV.fetch('GOV_ONE_REDIRECT_URI', '#GOV_ONE_REDIRECT_URI_env_var_missing')
-    config.gov_one_logout_redirect_uri = ENV.fetch('GOV_ONE_LOGOUT_REDIRECT_URI', '#GOV_ONE_LOGOUT_REDIRECT_URI_env_var_missing')
-    config.gov_one_private_key = ENV.fetch('GOV_ONE_PRIVATE_KEY', credentials.dig(:gov_one, :private_key))
-    config.gov_one_client_id = ENV.fetch('GOV_ONE_CLIENT_ID', credentials.dig(:gov_one, :client_id))
+    config.gov_one_base_uri     = ENV.fetch('GOV_ONE_BASE_URI', '#GOV_ONE_BASE_URI_env_var_missing')
+    config.gov_one_private_key  = ENV.fetch('GOV_ONE_PRIVATE_KEY', credentials.dig(:gov_one, :private_key))
+    config.gov_one_client_id    = ENV.fetch('GOV_ONE_CLIENT_ID', credentials.dig(:gov_one, :client_id))
 
     # @return [Boolean]
     def live?
diff --git a/config/locales/en.yml b/config/locales/en.yml
index e3f7c11b4..776d69931 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -571,15 +571,15 @@ en:
       %{criteria}
 
   # /gov-one/info
-  gov-one:
-    info:
-      title: Gov One Login
-      body: |
-        # Gov One Login
-
-        This is some information about Gov One Login... 
-      sign-in-button: Sign in with Gov One Login
-      sign-out-button: Sign out of Gov One Login
+  gov_one:
+    title: Gov One Login
+    body: |
+      # Gov One Login
+
+      This is some information about Gov One Login...
+    links:
+      sign_in: Sign in with Gov One Login
+      sign_out: Sign out of Gov One Login
 
   # /settings/cookie-policy
   cookie_policy:
diff --git a/config/sitemap.rb b/config/sitemap.rb
index bfdaecb7f..901358c90 100644
--- a/config/sitemap.rb
+++ b/config/sitemap.rb
@@ -14,8 +14,7 @@
 #     }
 #   ]
 #
-protocol = Rails.env.production? ? 'https://' : 'http://'
-SitemapGenerator::Sitemap.default_host = protocol + ENV['DOMAIN']
+SitemapGenerator::Sitemap.default_host = Rails.application.config.service_url
 SitemapGenerator::Sitemap.compress = false
 
 # Run this command to update /public/sitemap.xml
diff --git a/docker-compose.dev.yml b/docker-compose.dev.yml
index 6f104f3b5..8e3a4eeed 100644
--- a/docker-compose.dev.yml
+++ b/docker-compose.dev.yml
@@ -19,12 +19,9 @@ services:
       # app config
       - DATABASE_URL=postgres://postgres:password@db:5432/early_years_foundation_recovery_development
       - RAILS_ENV=development
-      - DOMAIN=app:3000
+      - DOMAIN=localhost:3000 # put back to app
       - RAILS_SERVE_STATIC_FILES=true
-      # gov one login
-      - GOV_ONE_BASE_URI=https://oidc.integration.account.gov.uk 
-      - GOV_ONE_REDIRECT_URI=http://localhost:3000/users/auth/openid_connect/callback
-      - GOV_ONE_LOGOUT_REDIRECT_URI=http://localhost:3000/users/sign_out
+      - GOV_ONE_BASE_URI=https://oidc.integration.account.gov.uk
     volumes:
       - .:/srv
     tty: true
diff --git a/docker-compose.test.yml b/docker-compose.test.yml
index 7b61fe942..47551644c 100644
--- a/docker-compose.test.yml
+++ b/docker-compose.test.yml
@@ -15,7 +15,5 @@ services:
       - BOT_TOKEN=bot_token
       - TIMEOUT_MINUTES=25
       - GOV_ONE_BASE_URI=https://oidc.test.account.gov.uk
-      - GOV_ONE_REDIRECT_URI=http://recovery.app/users/auth/openid_connect/callback
-      - GOV_ONE_LOGOUT_REDIRECT_URI=http://recovery.app/users/sign_out
     tty: true
     stdin_open: true