Career
He represented the Dulwich constituency on the London County Council (forerunner of the Greater London Council (Greater London Council)) between 1958 and 1965. Lamborn was elected to the successor body, the Greater London Council in 1964 for the constituency of Southwark and was re-elected in 1967 and 1970. He was Deputy Chairman of the Greater London Council 1971/2.
After Ray Gunter resigned from the House of Commons, Harry Lamborn was elected at a by-election in May 1972 for the constituency of Southwark.
After his constituency was eliminated in boundary changes, he ran in the newly configured Peckham and was comfortably re-elected in the February 1974 general election when the Labour Party returned to office, albeit without a majority. He was Parliamentary Private Secretary (Parliamentary Private Secretary) to the Chancellor of the Exchequer, Denis Healey from 1974 to 1979.
At the general election of 1979, the Labour Government was defeated, and a Conservative Party Government was elected under Margaret Thatcher. Lamborn was comfortably re-elected but with a reduced majority.
He died in August 1982 and was succeeded in the Peckham constituency by Harriet Harman in a by-election later that year.