Thanks for all your advice and for pointing out that I need to ask for cash. I'd put Paypal only in the auction advert as it never crossed my mind that people could collect the item and then claim they hadn't.
paypal never protects the seller for a collected item - they have no proof of delivery whatsoever. Plus if the buyer pays by paypal, wants to return for a refund, they have to return with online proof of delivery to get their money refunded.
Still no word from the buyer so I sent them an email yesterday saying that if I had not heard from them by this Sat I would a raise.
Still no contact so I opened a case. Next thing a box pops up asking me if \I want to use Ebays Unpaid item app which will open and close cases for me. SO I said -OK. Then looked for case details but it seems that this Unpaid item app will only open a case 32 days after the close of the auction -not quite what I had in mind. \I just want the original winner to bugger off so I can re-auction -not have it sitting around for another 32 days!
I opened a case and closed it after 8 days as buyer had still not been in touch. Ebay said that the buyer would get a non-payment mark against them.
Last weekend I relisted the item. Have had one bid from a buyer whose username is very, very similar to my non-paying buyer from the last time I auctioned the item. This new buyer has only a rating of 2 and only started buying items on ebay this month (having registered last summer).
I have contacted the new buyer and reminded them that the item must be collected from me i.e. I'm not posting it etc. So far no response.
If the new buyer doesn't contact me I'm tempted to cancel their bid. I'm pretty sure it's the same buyer as last time (who I have blocked).