First of all thanks for taking the time to educate my peasant ass, and It’s 0.1GBP/kWh

Would you advice against purchasing second hand miners from Alibaba?
Also what is your opinion on ETH mining compared to BTC mining in terms of short term/long term profitability.
I read somewhere the ETH proof of work model will change to proof of stake on the blockchain thus not requiring mining power for transactions? I could be wrong in understanding sorry.
And thank you for explaining to me the right and cheap way to setup my electric.