Currys sometimes do ipad discounts. Watch out for their Black Friday events (Nov).
I got £100 off a my galaxy tab last year in their black friday event. iirc their discounts on ipads weren't as good (£20-30), but its better than nothing.
Apple also do their own Black Friday events. Its a while ago now so I cant remember but Im sure we got £30 off an ipad Air2 for dad in Nov 2014.