Whilst continuing my search for a decent i7 laptop at around £500, I found this in the John Lewis Black Friday sale.
Lenovo Ideapad 310 Laptop
Intel Core i7-6500U dual core CPU
Nvidia GeForce 920MX (2GB) graphics card
2TB HDD, 5400 rpm
15.6" screen size, supporting 1920 x 1080 resolution
This is the silver version, last night the black version was showing as £615, today the black isn't available
John Lewis 3 year guarantee
This offer ends at midnight on 28th November.