OK, not ebay, but paypal...

[ButterPie]

I am hiring a coach to transport my wedding guests from Preston to Gateshead and back and need to collect about £15 each off about 30 people. I'm thinking paypal is the best way to do this, am I right? How do I do that?

you either need to give them all your e-mail address and get them to enter it very, very carefully (just in case someone with a similar one ends up with the money!)
or, get their e-mail addresses and send them each a request