Your best bet is to use
www.transferwise.com to convert and move GBP to MTGOX SEPA EUR account, and trade in EUR.
I've seen where Mt. Gox only accepts bank transfers if it comes from your own account (and not a commercial account like Transferwise). Are you able to perform this SEPA transfer method from Transferwise to Mt. Gox and they take it? With SEPA transfer to BITSTAMP I've not read about anyone claiming the same restriction.
Which exchanges allow me to transfer funds from my TransferWise account? -
http://bitcoin.stackexchange.com/questions/8149Also, other methods include:
Bitbargain.co.uk has a few methods:
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https://bitbargain.co.ukBitcoin Fridge re-opens on April 6th:
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http://www.BitcoinFridge.co.uk