I do live outside the UK, but most of the time, i buy records on the artists' website directly, and not on amazon or whatever. Most of the time they get 100% of the price.

Depends on their particular record deal TBH, just because they are selling digital or physical copies via their website it doesn't always mean they are getting the full take. The more modern deals for overseas territories include selling D/L to IP addresses from websites, so for example a British artist has an American distribution deal, and a USA based fan buys from their website then under that sort of deal the distributor would still be entitled to a pre-agreed cut of the sales under the terms of the deal.