[Edit: Not suitable for gaming]
A 1440p monitor under £200 with VESA mount.
I'm not sure whether to go for this with its VESA mount, or the Acer one for £230 and much thinner bezel.
Edit: Here's a review:http://www.expertreviews.co.uk/accessories/pc-monitors/1404147/aoc-q2778vqe-review
Most salient point I could see are:
"There is a slight issue with this monitor's input lag time; we measured it at 38ms, which is on the high side especially if you're planning on playing games."
You might want to investigate further before buying for gaming.