Overclockers UK is a decent site I've used a few times over the last few years for ordering parts and my latest monitor -BenQ G2420HDBL 24" Widescreen LED Monitor
That is slightly above your price range, but there is a slightly smaller version with the BenQ G2222HDL 21.5" Widescreen LED Monitor for £130 +Delivery
There are quite a few other monitors on the site, though not many that fit your requirements for 1080p, 2ms response and sub £140, but you might see something you like. Overclockers have a weekly deals section which changes every Wednesday (I think) so check back from time to time and the monitor you want might get a price drop.
Other UK sites worth checking out are Dabs, Scan and ebuyer (for some reason Gamespot keeps giving me errors when I add those as links)
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