yo my fellow briton!
as far as the UK market goes - pcspecialist.co.uk is where it's at as far as the best bang for buck laptops.
as far as £1000 gets you - it's about a gtx 870M - this is the setup to a 15" - https
/www.pcspecialist.co.uk/notebooks/SkyFireIII-15/
or a 17.3" - https
/www.pcspecialist.co.uk/notebooks/SkyFireIII/
but yeah you can have an I7, 8GB, 870M and a few extra trimmings for around £1000. so go crazy.