Sources and methodology

Last reviewed 28 October 2026

Where the facts come from

I use primary sources first. The main ones:

How I check and date information

Facts I could not confirm in official sources

How often the guides are updated

All articles are reviewed at least once a quarter, and immediately after a Cabinet decision on the criteria, which the government reviews every six months.

Corrections

If you find an error, please tell us through the contact page. Corrections are made and the update date is changed.