high power costs means you need the most efficient gear.
if you want to mine BTC you need this gear:
https://altairtech.io/product/bitmain-antminer-s21-xp/
it is costly about 7,600 usd a unit or 6,208 pounds
if you sink in 100k you get 15 pieces = 93,120 pounds with left over for wiring filters cooling.
15 units do 4,050 th or 187.52 pounds a day no power cost figured in. So in 500 days if power was zero you would break even.
the real question is what do you burn . 15 units burn 1335 kwatts a day that is 133.50 pounds of you power cost is .10 pounds a kwatt
or 187.52-133.50 = 54.02 pounds a day profit. 1740 days to pay off the gear.
So 94,000 pounds for the best gear to mine btc will be terrible at .10 pounds a kwatt. higher cost would be worse
what does your power cost?
.10 pounds 54.02 pound daily profit
.11 pounds 40.67 pound daily profit
.12 pounds 27.32 pound daily profit
.13 pounds 13.97 pound daily profit
.14 pounds .62 pound daily profit
So If I were you I would not do it at .10 pounds a kwatt or higher power cost.
Power is minimum £0.25 ($0.30) in UK, typically higher. As I've already stated, unless the OP has access to free electricity or generates his own, mining BTC will not be profitable for him, in fact he will lose A LOT of money.