John Donaldson, Baron Donaldson of Lymington war in 1945. He served in the military government of Schleswig-Holstein, and was demobbed as a lieutenant-colonel aged 25. He married Dorothy Mary Warwick (later known as Dame Mary Donaldson), in 1945, having met her at Middlesex Hospital where she was working as a nurse. She later became the first woman to be a Member of the City of London Court of Common Council, the first female Alderman, the first female Sheriff and, finally, in 1983, the first female Lord Mayor of London. Together, they had two daughters and a son; his wife predeceased him in October 2003. Donaldson was
Jeffrey Donaldson Powell. Two of Donaldson's cousins were killed by the Provisional Irish Republican Army while serving in the Royal Ulster Constabulary: Sam Donaldson was killed in 1970 and Alex Donaldson, a Chief Inspector, died in a mortar attack on a Newry police station in 1985. In 1985, following the death of Raymond McCullough, Donaldson was elected in a by-election to the Northern Ireland Assembly to represent South Down. In 1996 he was first placed candidate on the UUP list for the Forum elections, virtually guaranteeing him a seat. This led to his selection in 1997, for the Westminster Parliament where he