The SSD is far too small for a gaming laptop and at this price.
Lovely laptop for that price, just a shame about the screen. Same with the others linked. Pro's and cons for each. Personally I got my eye on Inspiron 15 7000 Gaming or Acer Predator 15. A few hundred more but worth it.
I think I would throw this out as a good middle ground https://www.scan.co.uk/products/156-msi-ge62-7re-apache-pro-28ghz-core-i7-7700hq-8gb-ram-128gb-ssd-plus1tb-hdd-geforce-4gb-gtx-1050t Few quid more but new and doesn't have the bad screen of the Dell nor the piss poor build quality of the ROG.
Although the gfx specs are slightly better, you are down on RAM and Processor. Also having bought one of these last year in the black friday deals, i would advise anyone thinking of doing so not to. The quality is shocking and dealing with the abysmal 3rd party company who handle ASUS warranty was even worse. Luckily amazons returns policy was superb and refunded me 2 months after purchase.
http://ao.com/product/gl502vmfy410t-asus-laptop-black-47057-251.aspx?WT.srch=1&WT.z_MT=digidip_net&WT.z_RTM=PHG&WT.z_CN=100l1256&WT.z_AG=True+Content&WT.z_AT=&WT.z_KW £899 after cashback.