I'm sure most of us here are pretty intelligent and have done a lot of online purchasing, but I just want to post up a reminder. Recently (as in yesterday) I put my GT up on eBay to see if it would sell any quicker and I have already had three scamming attempts. The first one almost got me, although I sensed something fishy right from the get-go. I kind of got excited that someone was going to pay full price almost immediately so that sort of clouded my judgement for a bit but thankfully I was smart enough to call PayPal to verify any transactions and sure enough they informed me it was a scamming attempt.

-most scammers will not have any phone conversations
-emails from paypay.co.uk are bogus
-transactions involving Western Union are most likely scams
-don't click any links in the emails (check where the address is sending you to)

It's better to be safe then sorry so if it seems fishy then it probably is.

indeed, good save