anyone know who sells a M10 fine (1.25 mm) 200 mm stainless steel bolt?

Try Namrick's down near me in Hove, usually have everything:

http://www.namrick.co.uk/

Try PFS Hogwood Lane Indust Est. nr Arborfield 0118 932 8832. Cheers, Pewe

search on ebay for a shop called boltmeup. really good prices i thought, top service too