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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
Sir Alan Beith is this week celebrating 40 years as a Liberal MP.
He took the Berwick Upon Tweed seat in 1973 after Antony Lambton stood down.
He has since become Berwick's longest-serving MP and the longest-serving Liberal MP since Lloyd George.
This week marks Sir Alan Beith's 40th year as the Liberal Democrat MP for Berwick Upon Tweed.
He announced in August that he would not stand for re-election in 2015.