[1] He might have won the seat of Heston and Isleworth at the 1966 general election from Reader Harris, its Conservative MP, had it not been for a strong Liberal vote.
Additionally he also lost the Leicester South West seat in a 1967 by-election, and finally fought Chichester at the subsequent election.
In October 1980 he was so unhappy at the Labour Party Conference's support for unilateral disarmament that he announced that he would vote with the Tories on all defence issues.
In 1983 he lost his seat, polling 29% of the vote - although he almost pushed Labour into third place which allowed the Conservative candidate Terry Dicks to win.
Despite the above activities he was allowed to rejoin the Labour Party in 1996, then under the leadership of Tony Blair, who appealed to Sandelson's centrist values.