Can you get any mechanical keyboards for that price in the UK? I'm in the US so I'm not sure what sites/stores you're looking at, but if you search for mechanical keyboards with Cherry MX switches you might find some results.
Mechanical keyboards have a better tactile feel (if that makes a difference to you) - Cherry MX Blue/Brown switches tend to have a better feel, while black/red are sometimes preferred to gaming. In the end it's down to what you prefer.
For a cheaper price, I'd go with the Microsoft Sidewinder keyboards.
I have the Sidewinder X4 right now, got it recently and it's amazing. The backlight is perfect and pretty bright. The keys sound good, like mechanical ones if you like that sound, I know I do, and the macro keys and layout is perfect. From what I've heard the X6 keyboard is even better and bigger. But ultimately your choice.