This week marks the 40th year that Sir Alan Beith has serves the Berwick Upon Tweed constituency.
We've had a look back at some of the key moments of his career.
- 1970 Stood in the general election, coming third behind Antony Lambton, Conservative, and Robert Wareing, Labour
- 1973 Won by-election after Lambton stands down with a majority of 53 votes
- 1974 Held seat after general election
- 1974 - 1979 Became Northern Ireland spokesman for the Liberal Party, taking the role again in 1982
- 1976 - 1985 Became Liberal Party Chief Whip
- 1985 - 1987 Became Foreign Affairs Spokesman for the Liberal Party
- 1985 - 1988 Became the Deputy Leader of the Liberal Party
- 1988 Stood against Paddy Ashdown for the leadership of the Liberal Democrats
- 1992 - 2003 Became Deputy Leader of the Liberal Democrats
- 1994 - 1999 Became Home Affairs Spokesman for the Liberal Democrats
- 2008 Knighted in the Queen's Birthday Honours list