Damien

It's probably going to the end of the £500 limit. It's not illegal to receive foreign donations of under £500, you would have to question why foreign donations of any sort are allowed.

It would be against the law if one person is using the £500 undeclared limit to make multiple donations undetected. Quite substantially so. However the only real way to make that easy to enforce would be to get rid of the £500 limit and have all political donations be domestic and trackable. Maybe even link it to the electoral register so every single donation has to be from someone entitled to vote in the election or a company who is registered in the U.K for tax purposes.