There are now thought to be more than 6,000 pressure groups operating in this country and although their interests differ widely, they have one common purpose ... to make Authority change its mind.
George Scott investigates the growth of such groups: how they operate; what are the factors that make them succeed or fail: and whether or not they are a legitimate part of the democratic system or simply devices for vocal minorities to wield unjustified influence.
Producer JOCK GALLAGHER BBC Birmingham