I need to sell my bitcoins and get pounds sterling into my UK bank account.
Many Bitcoin exchanges offer to let you withdraw your funds as an International bank wire. The problem is the funds are generally going to be in a currency other than GBP and that trade then incurs currency conversion costs.
Bitcoin-Central just launched its BTC/GBP market. It doesn't have great liquidity yet, but it did just open. There are no reports yet as to how long after a pound sterling (GBP) withdrawal takes to reach a UK bank account.
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https://bitcoin-central.net/order_book?currency=GBPAurumXChange will let you sell an exchange's redeemable code (e.g., MTGUSD) for a bank wire (GBP). The fee appears to be about 5%.
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https://www.aurumxchange.com/sell