The Right Honourable Shirley Vivian Teresa Brittain Williams, Baroness Williams of Crosby, Companion of Honour, Privy Counselor to Queen Elizabeth II, was a Labour Member of Parliament and Cabinet Minister before becoming a co-founder of the more centrist Social Democratic Party in 1981. After this merged with the Liberal Democrats, she was made a life peer and served as the Leader of the Lib-Dems in the House of Lords from 2001 until her retirement in 2004.