What happens when planners build houses for people who then find they don't want to live in them? And industrial estates are offered to employers who prefer to build factories elsewhere? Some say the answer can be found at Haverhill, in West Suffolk. Twelve years ago a dying community of 3,000 country people, it's now an expanding town, population 12,000, most of it ' overspill ' from London. They live in housing estates financed by the Greater London Council. But many houses in Haverhill stand empty. Wages are below and prices (say the wives) above the national average. The planners, they say, have built not a Utopia but a ghetto of city dwellers in the Suffolk countryside.