The original immigrants were brought to UK from West Indies after the war (early 50's I think) to do the jobs which the indigenous Brits either would not do or to fill the vacancies caused by the loss of male lives during the war.
The first wave were 'grateful' for their new jobs, worked hard, were law abiding and stayed in their jobs until retirement. Unfortunately it was the subsequent generations of UK born 'immigrants' (some of whom) were and are the problem.
