We always tend to use Xoom these days rather than the painfully slow PNB through the London branch. It costs a little more than some other remit services but at least you don't have to provide your grannies life history in order to send a little money, under nanny B.Liar's "money laundering" regulations.We have found it quick and reliable.
Forexworld has also been reliable in the past for quick transfers with charges of $17 for a provincial delivery which is only slightly more than using PNB.

http://www.forexworld.us/default.asp