link: http://www.marine-covers.com
Bainbridge are a major supplier of cloth and fittings to the sailmaking industry. They are a trade supplier but PDF catalogues can de down loaded. There is also a web site www.sailcloth.com that is a consumer guide to sailcloth selection and sail design.
link: http://www.sea-sure.co.uk/
Sea Sure manufacture a variety of dinghy hardware, blocks, sailmaking hardware, shackles, O & D rings, rigging tensioners etc. There is an online catalogue with all product details.