The website I got em through was http://www.stagonset.co.uk/, pretty good range and quite cheap. The delivery (£1.50ish) cost more than all the fixings I needed :lol:
I used to work for Stagonset, and their website has been suspended since I left in July.
A number of us have since set up Westfield Fasteners with a very similar service, offering a range of stainless nuts and bolts.
I hope this is useful for you!
Jason