hello,
you should be able to get something with a gtx960m (970m, if lucky). here's a few options:
https
/www.amazon.co.uk/MSI-Leopard-1087UK-15-6-Inch-Notebook/dp/B01FM53NZ6/ref=pd_vtph_147_bs_lp_t_1?_encoding=UTF8&refRID=0PB56PDY2Y3ZHVHYZ1NZ&th=1
https

/www.amazon.co.uk/ASUS-Notebook-i7-6700HQ-Processor-Graphics/dp/B015OG3T1Q/ref=sr_1_1?s=computers&ie=UTF8&qid=1482038191&sr=1-1&
if you're willing to go a little over the budget (like £120 more), i would highly recommend the following (it has 1060, which is a current gen Pascal based GPU and will give you great gaming perf in all the modern and upcoming titles)
https
/www.amazon.co.uk/ASUS-GL702VT-GC018T-17-3-Inch-Gaming-Laptop/dp/B01LWJPHNO/ref=pd_sbs_147_1?_encoding=UTF8&refRID=CJ13TX4V5TQ3BD181WRX&th=1
cheers