Well, there's DGM IPS-2402WDH (£200), but it's a little bit over the budget. If you can compromise one inch on the size, then take a look at Dell U2312HM. It has been quite a safe and popular choice, I think. Furthermore, it's on sale on OCUK for this week (£150). It also comes with a pivot option, which could be nice.
Also remember that the DGM has a 16:10 aspect ratio, which can be good or bad, depending on your usage.
Then there's also the LG 27EA33V, which is around £200. It's cheap for a 27", but there's no such thing as "free lunch", so don't get your hopes up for the quality. Still, might be worth a gamble.