I predict this auction has a high chance of being shut down by eBay before it ends, since they enforce their rules in particular regarding payments – note at the end of the auction description it says:
Although it offers payment by paypal please don’t use it – Following the end of the auction we will issue you with details of how to pay so the money goes direct to GamCare
I’ve seen similar ‘charity auctions’ get shut down for bypassing ‘correct’ eBay/PayPal procedures, you need to organize this type of thing with eBay directly before starting the auction. It’s not like there’s some friendly manager at eBay saying to themselves “Oh it’s for charity, I’ll let it slide…” They’re not really known for that.