llms.txt check for gov.uk
gov.uk has no llms.txt: /llms.txt answered 404.
The exact fix
Create this file at https://gov.uk/llms.txt (edit the text after each colon, then add the pages that matter most):
# Welcome to GOV.UK > GOV.UK - The best place to find government services and information. ## Main pages - [change your cookie settings](https://www.gov.uk/help/cookies): one line on what this page answers - [Menu](https://www.gov.uk/browse): one line on what this page answers - [Benefits](https://www.gov.uk/browse/benefits): one line on what this page answers - [Births, death, marriages and care](https://www.gov.uk/browse/births-deaths-marriages): one line on what this page answers - [Business and self-employed](https://www.gov.uk/browse/business): one line on what this page answers - [Childcare and parenting](https://www.gov.uk/browse/childcare-parenting): one line on what this page answers - [Citizenship and living in the UK](https://www.gov.uk/browse/citizenship): one line on what this page answers - [Crime, justice and the law](https://www.gov.uk/browse/justice): one line on what this page answers
Draft a fuller llms.txt for gov.uk with the llms.txt generator
Next: the rest of the site
This tool reads one page and two files. The free check crawls a sample of pages and lists everything that keeps search engines and assistants from reading gov.uk, with the exact fix for each.
What a valid file does and does not do
llms.txt is a proposal for a plain-text map of your site for assistants. No major assistant has confirmed that it reads the file, so a valid file does not promise citations. It is cheap to publish and a good test of whether your own site map is in order; the crawler access check matters more.