I've just won an item on eBay which is located about 5 miles from where I live. Obviously I rather ask if I can collect it instead of paying £10 for the courier.

How do you contact the seller? When I click ask the seller a question it goes to a page saying I haven't paid yet and I can't find a way of getting in contact.

On the item page (where you first saw the item) at the top right corner it says "Seller Info" with the sellers "user name and a number (feedback rating) in blue.  If you click on that user name, you will be taken to another page, on the left side of that page  it has a box with "items for sale" Add to favourite sellers and "Contact Member"... click on this ,and you should be able to send a message.... (you need to be logged in )

HTH 

Thanks - I'd clicked Ask a question on the right hand side of the item's page!