I can tell you guys with the plans I'm starting to see come out of the UK in regards to Bitcoin I'm actually planning on leaving the country as soon as possible, new taxes and so on for Bitcoin will mean they aim to totally strangle it so it won't be profitable to even transact in the currency anymore, so either they'll force everyone back into the pound or people who want to use Bitcoin only will just leave the country.
Granted, they can't do anything to stop pure Bitcoin transactions on the blockchain thankfully but Bitcoin users are going to have a hard time paying for basic utility bills and so on if the taxes are too high and restrictive, they have refined taxation of the poor and middle class here to a fine art and I'm not going to hang around a country that doesn't want me to get wealthy.
have you actually phoned up HMRC or are you just reading forum/reddit speculation from the basement dweller crowd.
so far HMRC are sticking with the asset currency model. and not wanting to move it into the VAT ratable consumer product model. as bitcoin is not a "value added" product. a bitcoin is just a bitcoin. nothing more.
value added means a raw material that has either been manufactured into something that adds extra value to its cost, or a service that compliments the item to add value to its cost.
bitcoin is neither so bitcoins themselves will not be 'in the scope' of VAT. as for income/corporation tax, well any profits made you are suppose to be taxed if those profits are over the yearly limits so when you cash out more than £10k into your personal account, expect to be taxed on the excess.
this is where you will need to have a separate account to keep your investment trades away from your personal spending, purely to not treat every trade as a 'income' and to move only X amount to personal account to keep your accountant happy and easily show a separation from income spend vs investment trades.
yes i might be wrong, and osbourne may force HMRC to re-declare bitcoin under some naive and misunderstood category, adding lots of limitations etc. but so far it seems like idle speculation from the basement dweller crowd, and no actual fact from HMRC about changes that will make people want to leave the UK.