Here are some selected links to companies that I regularly use
Mirka
Abrasives and dust free sanding
Little Greene Paint Company
High quality paints and wallpaper
Mythic Paint
Completely VOC free paints
Wooster Brush
Decorating tools
Toupret 
Extensive range of fillers for every application
Krud kutter
Eco friendly, non toxic cleaning and preparation products
Polyvine
Varnishes and decorative painting supplies
Markjpurseyandson.co.uk
High quality Joinery company based in Holt, Wiltshire