I have just learnt a hard lesson from WH Smith. I circumvented the geographic restrictions, then forgot to topup my debit card - so it got declined. I am now worried that the obvious error in my address will be picked up by them and they will close my ebook account. Hopefully their recheck on my debit card in a few days time will be automatic - otherwise I've cooked my goose......
Note to self - remember to top up debit card before trying to buy ebooks