ive used the brakers yard in Manchester for bits and pieces - they send out real quick - i got my parcel shelf pretty much the next day - there a few brakers on ebay - they advertised juke for parts - but it look like a car advert - you email them on ebay asking for stuff they get back to your pretty quick. the other one i have used is 1st choice - that has a database of brakers, dealer who then contact you with prices and stuff. that how i got the parcel shelf company but then was going direct for a few parts after. I'm very new to this though so i am sure others may have more reliable options 
