https://www.theguardian.com/politics/2019/nov/04/facebook-and-google-asked-to-suspend-political-ads-before-general-election

Letter calls for suspension until after vote due to lack of time to reform online advertising rules

The UK does not have time to solve the problems of online political advertising before the general election, meaning it should be voluntarily suspended by Facebook and Google until after the vote, campaigners, academics and non-profits have said.