I know you're just spamming 100s of nonsense posts to gain posts then scam someone, but I'll answer your question anyway. They'll rape you.

Account for bitcoin transactions in the same way you would track how much money you've made from them. Need to track £ price in and out, to work out final profit in £, then declare it under self assessment. Its non VATable though.

https://bitcointalk.org/index.php?topic=153332.new#new