> What are campaign finance laws like in the UK? Can he crowdsource this to offset his cost?

Anybody can donate to a political party in the UK so that's how you would do it.

There's no citizenship/residency requirement AFAIK.

Here is his official entry on the register: https://search.electoralcommission.org.uk/English/Registrati...

No, anybody can't donate to a political party in the UK:

  Political parties are responsible for checking the source of loans and donations over the value of £500 to ensure they come from permissible sources.

  Foreign companies and individuals who are not on the UK electoral register cannot make political donations.

Other countries likely have similar restrictions e.g. New Zealand disallows foreign donations, and the source of larger donations much be known although I'm not sure if public (i.e. no anonymity above $X). Two digit millions is a significant amount in NZ politics.

Well, you linked to his registration entry but that's not donations. In fact he doesn't have any donations so maybe that's why you were confused. If you look for a political entity which does have donations, like Reform, you can see £50M over the years since it was formed (then as the "Brexit Party")

And it's not true that "anybody" can donate. People can donate if they'd be allowed to vote in the UK, which currently includes people who don't live here and so don't care what happens but that might change to some extent. Non-people such as businesses can donate if they are legitimate UK entities with UK registration or whatever as appropriate (so e.g. a UK business you own for no purpose but to fuck with UK politics wouldn't fly, but if you've got a money-losing Californian Wine Importer that's a fun hobby you can make that loss $5000 bigger by having them them donate $5000 to Reform if you like)

Not quite. The problem is that rich people can find ways around the laws.

https://www.electoralcommission.org.uk/political-registratio...