Was looking on the RobinHood website last night and i see they have a link to a Donor car supplier (sorry but i can't do links yet but i'm sure someone else will help). It looks like its probably a sister company like Lolocost but it could be useful if you're looking for a cheap Sierra.

http://www.donorworld.co.uk/

It's a Robin Hood company.

I had a look but reckon it's all a bit dear.

yup, prices are a joke. as always, do it yourself and save a fortune!