I think it's common with any purchase out of country, you need to be aware of whether the warranty will be honoured or not.
Also, if I purchase something and it's defective, I don't expect a refund, I expect replacement with equal or greater value. If the jacket's not available anymore than I'd accept a better jacket.
I bought a Burton T6 snowboard, first day I used it the top started to delaminate. Took it for warranty service, there were no T6's left, so they gave me a brand new T7 instead.
Needless to say I've been pretty happy with their warranty service.
Heard lots of cases of people buying cell phones or other things while travelling, and having warranty issues at home.
I'd say the original store you bought it from should have dealt with it instead of passing it on to a UK store. Keep in mind that you bought it from them, where you were riding, and they shouldn't have to send the replacement to the UK.