MARCH 16: Harold Wilson, Labour leader for 13 years and Prime Minister for almost eight, announced his resignation in 1976. It has since been claimed that Wilson's fears over his own mental state led to this shock decision. Harold Wilson, pictured in 1963 when he was Leader of the Opposition. R/I 31/12/95 Official documents released under the 30 year rule show decisions made by Mr Wilson's Labour government of 1965. * R/I 14/8/96 Wilson's fears for his own mental state led to his shock resignation in 1976, according to a TV documentary. The disclosure about the former Prime Minister, who died in May 1995 of Alzheimer's Disease, comes in an interview with family friend Dorothy White.