Coinbase will deposit into a uk bank account once you are verified. You would really need to speak to an accuntant as said as (I believe) if it over a certain amount of earnings then it is deemed income and thus subject to being taxed at the applicable rate. If you have a gaming rig with a couple of cards and earn a few quid then I probably wouldnt worry too much.
I would look at the same way. If you are not building 10 x 6 card rigs and as
gt_addict wrote if you have a gaming rig with a couple of cards and earn a few quid then I probably wouldn't worry too much. Happy mining.