Bingo Bango Orchestrator
LGs are consistently excellent for the price.It's on Amazon (via Sotel) for £550 - though I'm not sure how official it is for the UK as the reviews are both in German.
This is an example of someone saying the GP is noticeably better than the GN, compared to the GN not being much better than the GL:
The LG 27GP850 is the true successor to the 27GL850, one of the most popular 1440p IPS gaming monitors of the last few years. The substantial update...www.techspot.com
But not the only one I've seen.
TBH I think I'm going to go for the GL from Currys. I think there's a general consensus that the LGs are decent monitors, and that's helped a great deal. It's all pretty subjective, but it's always worth checking you're not going for something at the genuinely poorer end of the range.