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.

So you're telling me that < £500 won't be a problem...

Perhaps there's an intergalactic mixing service that can be used here to assist in finally solving this hand dryer situation.