I wouldn't contemplate buying a good guitar in the UK. I bought my Collings from Mandolin Brothers (Staten Island) and saved a load of money, even counting the airfare (though I was over there for other reasons anyway).

Or you could try ebay - at least have a look at ebay and see what an array of stuff you could have. And if it's only available to the USA, get one of these nice Mudcat people to receive it for you and send it on.