Ditto DigitMus's comment on the Raxxess Isoraxx. I bought one, sight unseen, since there weren't any within driving range to audition. And I had to return it. I was very happy with my rep at the company I bought it from for taking it back- all I lost was the price of the return shipping, which wasn't cheap...
It was noiser than the gear I was putting in it as well (Fostex D1624 and a rackmount DAW). The air intake is on the bottom, so the "removable casters" really aren't removable at all: the unit would starve for air, and the door would also drag on the carpet when you tried to open it. Unfortunately, with the casters in place, it is several inches too tall to rest a tabletop on, unless you like to mix while sitting on a barstool. And the reversible door is only reversible if you are willing to have a bunch of empty screw holes to look at- the hinge hardware and the latch hardware are inexplicably mounted on completely different spacings, and leaving the unit in its stock right-hand opening configuration wouldn't have worked in my space.... So for me, it was a complete lose. Just my opinion, but I'd look elsewhere.
I solved my problems by reengineering the cooling airflow paths, fan speeds, and acoustical damping inside the D1624 and DAW boxes. And I think that I get along better without a hushbox. Now, I just have to figure out how to quiet down the power supply in my Ghost...
Caveat emptor! I believe that hushboxes really need to be auditioned before you lay out the green. Might be tough in London if the vendor's in the States, though... Best of luck!