I bought a Blackberry from Phones4U, but as you may be aware there is compulsary top-up needed with the purchase of a new PAYG phone. The sim card was activated by a member of staff there despite my hardest efforts to restrict this. Can be sent with Sim Card Documentation if required.
I have an Ebay account with 100% positive feedback, holding 87 transactions recorded to date if you require as peace of mind.
Postage will be Second Class Recorded, and is included in the price.