Here are two that I have had experience with. The first one is a smashing bloke, very helpfull, freindly and accommodating. He supplied a case to my exact specs, unfinished so that I could finish the wood myself.
The second link proved to be not very freindly nor accommodating so I wouldn't recommend them unless someone is desperate.
http://www.cabinets.col-uk.com/ http://www.dscshowcases.co.uk/