checking up on an earlier expired deal on the Dell U2311H, I noticed there's a 20% rebate at the moment, bringing the total delivered to £191.04
update: thanks roister for noticing a rebate code. KF7WP4QSZZ$WVZ bring the price down to £181.49
10% Quidco too (paid on price without VAT and delivery). Should be ~£15. So net price should be about £166.50.