Found at the Currys at the Cathedral Retail Park in Wakefield.
It's no longer listed on the Curry's website so very probably clearance.
For those unsure of the function of the crossfire adaptor, it allows you to use your pad and up to three other xbox 360 wireless game controllers with your pc.
The adaptor has been discontinued as far as I know and is therefore fetching a high price on ebay so you could sell it if you didn't want it and still get a pad for a reasonable price. The pad is of course the older white one with the grey d-pad as there was never to my knowledge a black d-pad variant released with the adaptor.
Hope it helps someone