Barbara Castle, Labour MP, visiting Love Lane Primary School, c 1947.
© NMeM / Daily Herald Archive / Science & Society Picture Library
Barbara Castle (1910-2002) entered parliament in 1945 as MP for Blackburn. She first attained cabinet rank as Minister of Overseas Development (1964-1965), and as Minister for Transport (1965-1968) she introduced a 70mph speed limit and the 'breathalyser' test. After working in the newly created post of Secretary of State for Employment and Productivity, and later Health and Social Security, she retired to the back benches in 1976.