Hi Kaz - if you hop on the Milltek site they have a linkie for suppliers - you're looking at £750-900 supplied and fitted brand new.
I don't think you'll regret it but then I am biased Mine was second hand and well broken in - when you give it some beans over 4k its fab- it still makes me every time I'm out on track but I won't bang on about it again....just search the forum for 'Milltek'