Sorry can't help much I got my Auxiliary belt from the local citroen dealer about 35 quid I think, I always try and get stuff local it's ofter faster and easier if the is a problem! though I am just an amateur!
Here are a few bookmarks but I not used any of them!
http://www.eurocarparts.com/ http://www.gsfcarparts.com/ http://www.carsparesdirect.com/ http://www.sgs-engineering.com
I got mine from GSF when they were having a 35% discount offer, as I think they are at the moment although I can't find the email with the code.
thanks guys...ill have a look through those.
they seem a bit on the expensive side compared to the prices on other parts ive seen.
thanks again ..cheers dave.