There is a booking agent on ebay called payperdrop. They charge £5.99 and the courrier is DHL. Some people have had trouble with them, but I have had 7 pick ups and delivrys this week with no problem what so ever. My sis uses them alot to. Just type in parcel delivary into the search and you'll find then. HTH
I used payperdrop this week. It was very reliable.
If you don't want to use them through their ebay shop you can just telephone them and they will take your payment over the phone and you fill in all the collection/delivery info via their on-line form which they email to you.