The UK treats virtual currencies just as it would any other currency.

The latest HMRC guidance states that anyone can buy, sell or mine virtual currencies in the UK.

It also states that taxes are due on selling anything priced in virtual currencies just as they would be if you offered something for sale in the UK in euros or dollars. If you mine in the UK then taxes are required on the profits from mining or if you buy and hold virtual currencies and profit then you are taxed using the existing Capital Gains taxation.