1) Move out of the UK, if you want to stay in Europe pick malta or cypress.
Outside EU, pick thailand, laos, cambodja or philippines
2) calculate how much it would costs to sit around and party for 2-3 years
3) cash out required amount and set up bankaccount
4) cash out some more to treat all STD's picked up along the way
5) if after 3 years your BTC are worthless, go back home and continue life; if BTC are king repeat or rethink investments.

Just enjoy this epic rollercoaster you've just been on, instead of pondering about investments etc.

EDIT: just read how you're 15 ... meh, do it anyway

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True advice: get an accountant instead of asking it on this forum, costs a few £100 but might save you a ton.

Look up benificial tax % in UK. fe. gambling, so move it to clubwithseals, trade versus pokerstars money, cash out pokerstars account, no (or little) tax paid