After a bit of looking around I got my quickshift from GMC:
http://www.gmcmotorsport.co.uk/clutc.../prod_482.html
And the linkages from Pug1Off:
http://www.shop.pug1off.com/product_...00a6ebb46d12fa
These seem to be the cheapest places to get them, the rest of the linkage parts are only available from a Citroen or Peugeot main dealer as far as I'm aware
And as for the linkage knocking on the car I've no idea, maybe you've managed to bend one of the arms it's attatched to, if the control arm is bent back that could cause it. Mine had loads of clearance so yeah it's possible if you have a worn engine mount it's allowing too much movement, couldn't tell without looking!