Hi Xara,

Why don't you give Waterstone's a try - www.waterstones.co.uk - I had a quick look and they seem to have the full selection in paperback, hardback and audio tape.

If you don't want to trust your credit card to the site, then look up the contact details for their Gower St, London store (it's the biggest one). I'm sure they'd happily do transactions over the phone.