In the latter part of his career as a BBC producer Simpson frequently clashed with the management of the organisation. In the 1970s he was one of those – Hans Keller and Deryck Cooke were others – who started the (unsuccessful) revolt against the report "Broadcasting in the Seventies" and its plan for "generic broadcasting" (i.e. separate networks for pop, classical and speech). A decade later Simpson was energetic in his opposition to a cost-cutting reorganisation that ultimately proposed the decommissioning of five of the eleven BBC orchestras. During the ensuing musicians' strike (which caused the cancellation of the first several weeks of the 1980 BBC Promenade Concerts) Simpson chose to disregard BBC staff regulations and discuss the matter with a national newspaper; he then resigned from the corporation, publicly alleging a "degeneration of traditional BBC values in the scramble for ratings". (Hans Keller later described these criticisms as "demonstrable fact".) Had Simpson remained silent for a few more months he would have been able to retire with a full pension, but his feeling was that such a course would have compromised his principles. Abominating the ethos of Thatcherite Britain, in 1986 he moved to the Republic of Ireland, settling on Tralee Bay in Kerry. In 1991 he suffered a severe stroke during an English lecture tour, which caused damage to the thalamus and left him in debilitating pain for the remaining six years of his life. He died in Tralee in 1997.