Mining (especially in the UK) is a mugs game now, so difficult and time consuming to make decent cash unless you've got custom hardware and have tiny/no electricty costs (think a sub zero warehouse of noisy mining rigs in China)
Saw a recent YouTube vid of some UK guy who spent £2K+ on a custom 4GPU self build mining rig, after building it he calced that it would him take 2 years running 24/7 in the UK to make back the cost of the rig.
As I type this I'm just started an Ethereum (pool) miner on my laptop in a window in the background, thrashing the GPU.
Look, I've just made cash out of thin air .. yipee. I'm a genuine miner - something else for the CV
ETH: 11/16/17-11:27:49 - New job from <snip>
ETH - Total Speed: 19.611 Mh/s, Total Shares: 0, Rejected: 0, Time: 00:09
ETH: GPU0 19.611 Mh/s
GPU0 t=62C fan=0%
ETH: 11/16/17-11:28:07 - SHARE FOUND - (GPU 0)
ETH: Share accepted (110 ms)! <-- I've mined Ethereum, yipee !
ETH: 11/16/17-11:28:11 - New job from <snip>
ETH - Total Speed: 19.559 Mh/s, Total Shares: 1, Rejected: 0, Time: 00:10
ETH: GPU0 19.559 Mh/s
ETH: 11/16/17-11:28:14 - New job from <snip>
ETH - Total Speed: 19.633 Mh/s, Total Shares: 1, Rejected: 0, Time: 00:10
ETH: GPU0 19.633 Mh/s
ETH: 11/16/17-11:28:27 - SHARE FOUND - (GPU 0)
ETH: Share accepted (109 ms)! <-- I've mined Ethereum, yipee !
However the amount and rate of my earning is 'so low' and UK electricity costs so high (world relative) it will take me days running 24/7 on this lappy to afford a mars bar - plus my hardware will be shot.
But if I rent a warehouse in China and buy a shed load of custom rigs ..ummm..