Sue Lawley's castaway this week is the politician Baroness Williams of Crosby. Shirley Williams has spent her life immersed in politics. Her father was a Labour Party activist and her mother the writer and pacifist Vera Brittain. Their home was always filled with topical conversation, from the rise of Hitler to the Spanish Civil War.

She became a Labour Party member when still a teenager and, after a chance encounter in an air-raid shelter, formed a friendship with the then Home Secretary Herbert Morrison. She enjoyed a career within the Labour Party but, dismayed by its drift to the left, she abandoned it to become one of the Gang of Four who set up the Social Democratic Party in 1981 and later supported its merger with the Liberal Party. Now, as the Liberal Democrats are in the midst of leadership elections, she reflects on the difficulties the party has faced in recent months, and what it must do to regain public support.

[Taken from the original programme material for this archive edition of Desert Island Discs]

Favourite track: How Beautiful are the Feet by George Frideric Handel