It looks like for the UK, you have the choice of CAN/AUS/NZ, Singapore, Hong Kong, Taiwan, Japan (pleasantly surprised to see that) and South Korea. There's als

It looks like for the UK, you have the choice of CAN/AUS/NZ, Singapore, Hong Kong, Taiwan, Japan (pleasantly surprised to see that) and South Korea. There's also summer camp work in the US via BUNAC (which you pay for), but why bother when you can get a visa waiver for 90 days?