https://www.cnet.com/news/facebook-brings-its-political-ad-rules-to-the-uk/

The change follows similar rules being rolled out in the US in May, and the social network's promise to investigate the spread of Russian misinformation tied to the 2016 Brexit vote.

In addition to these rules, Facebook is expanding its election ad database tools -- previously available in the US and Brazil -- to the UK, showing all of a given advertiser's previous ads, the amount spent and the demographics the ads targeted.