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
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The historic event always takes place on the last Friday in July.
Early enquiries suggest the men may have taken the drug Blue Valium. Two of them remain in hospital with breathing problems.
More than 8,000 people are expected to attend over the three day event, which starts at 7pm tonight.