Lomax - Icicle - Vital Elements - Audio - Panacea - Me - Misanthrop - Proktah - The Qemists - Cause 4 Concern - The list goes on!
God there are so many underated producers, but I think in actual fact the issue here is they're not under rated at all, as a whole load of people do in fact sing their praises alot. It's just in terms of the UK mainstream, i.e. what you hear all the sheep going on about, these producers are not rated highly enough - again that relates to the altered state of our scene nowadays.
Alot of these guys regularly mark their turf overseas and I know a few artists, including a certain female singer who rely on record sales and gig revenue that comes predominantly from overseas sources just to live! Now whether you can say that they just didn't cut it for the UK market - that's a whole seperate debate! Nonetheless I think the UK scene has been saturated with quality producers and DJ's and in fact there is SO much talent that get's completely overlooked, which is a shame.
I bore my self!