I hear good things about bit stamp. But do your research.
BitStamp doesn't accommodate UK transfers (unless maybe as international wire transfer which is very expensive.)
Intersango has problems right now serving those in the UK:
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http://support.intersango.com/statusAbout the remaining option is Mt. Gox. You can deposit cash at Barclays for credit to your Mt. Gox account. A 1.5% fee applies:
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https://en.bitcoin.it/wiki/MtGox#UK_.28GBP.29 There is a site called London Bitcoin Exchange, though there is not much about them yet so if you do trade, perhaps use an escrow.
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http://londonbitcoinexchange.wordpress.com/You can send cash (GBP) or check to Bitcoin Nordic, by mail, to purchase bitcoins:
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http://en.bitcoin.it/wiki/Bitcoin_NordicYou might find a local trader (or place an buy order and see if anyone is selling):
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http://www.LocalBitcoins.comThere are a number of methods:
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http://en.bitcoin.it/wiki/Buying_bitcoinsYou will find someone willing to trade at the London Bitcoin Conference:
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http://www.bitcoin2012.com -
http://bitcointalk.org/index.php?topic=67199.0