Coolermaster Quickfire Rapid ? That should be around the price and is a very solid keyboard all around.

http://www.amazon.co.uk/Noppoo-Mechanical-Key...+choc+mini

It's hard to find something mechanical that's around 50£. It's a good keyboard but the only thing is that the switches are black.

http://www.amazon.com/Noppoo-Mechanical-Gamin...mini+brown

From the US, but the swtiches are blue which is more like the brown ones. They are just a bit heavier, has more tactile feedback and has a louder sound. Costs about 55£.

Look for CMstorm quickfire, they go for dirty cheap on ebay

Qtang has a store with slightly lower prices than ebay - http://www.vendio.com/stores/E-sports-Gaming-equipments/

edit: Rapid TKL ~£52

key cool on ebay

Cheers for the replies guys, but he ended up getting a cheap Corsair K60.. Not what I recommended but a good keyboard nonetheless.