Airfix

Airfix is probably the best know manufacturer, in their own words:

Airfix is the oldest UK manufacturer of scale plastic model kits and has been producing kits for the mass market since 1952. Airfix produce a wide range of kits aimed at all types of scale modellers with subjects such as; military aircraft, ships, cars, dioramas and military vehicles.

For a comprehensive list about Airfix scale models check Henk of Holland site.

For figure set we outstanding recommend Plastic Soldier Review site.

http://www.airfix.com/