 During the mid 1970s , he had been involved in a number of disputes with his neighbours , the Burkitt family , of 16 Andrew Road , alleging that the noise of their television and record player disturbed him and his parents . This became an obsession , and he suffered the delusion that his neighbours were mocking him . On one occasion , during a row about noise , he told Philip Burkitt " I 'm going to exterminate you " . 
