Merge pull request #927 from IIIF/ESTA

add esta info

source/event/2025/leeds/travel.md

@@ -10,11 +10,18 @@ breadcrumbs:
     link: '{{ site.root_url }}/event/2025/leeds/'
 ---
 
+## Electronic Travel Authorization (ETA)
+
+Most attendees visiting Leeds from outside the United Kingdom and Ireland will need an Electronic Travel Authorization. **This is a *new*requirement for 2025.**
+
+Please read the following guide for more information regarding who needs an ETA and how to apply on the [UK Visas and Immigration website](https://www.gov.uk/guidance/apply-for-an-electronic-travel-authorisation-eta). Authorizations take 3-5 business days to process and you must apply before your travel date. 
+
 ## Travel by air
 * The nearest airport is [Manchester Airport (MAN)](https://www.manchesterairport.co.uk/)
 
 ## Travel by train
 * The nearest train station is [Leeds Station](https://www.nationalrail.co.uk/stations/leeds/)
+* [Train tickets](https://www.thetrainline.com/) are released 3 months in advance. Please book early for the best prices. 
 
 ## Accommodations