Hi mattyoaks, I did some hunting around on the web and unfortunately it seems that unless your running Vista 'Ultimate' you cannot change the installation language. Here's one web page I found:
How to change language to English please - Setup and Install
So it looks like you might have to visit that shop after all although I'm going to do a little more research to see if there's an alternative. Hmm... seems like there isn't I'm afraid.... sorry man

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