Razer Blackwidow Chroma mechanical keyboard down from £139.99 to £89.99 at Overclockers.
I already have this keyboard and love it. The fact that it has a audio and usb pass-through are super handy and I'm a big fan of the switches used. The RGB lighting is excellent too but know this will be divisive ;)
I'm not sure what P&P is at Overclockers these days but some forum members do qualify for free shipping.