just checked on US automitive website - they do have one, but its a remanufactured one and quite pricey at £116 though you will get free delivery.

Probably best try Real Steel or Rodleys as mentioned above in the first instance.

I did think I also saw them on ebay recently - maybe Les at SMC had some.....

in fact - here you go! i'm gonna order one as a spare at this price - 20% off.

http://www.ebay.co.uk/itm/Rover-75-V...item2ead96498c