Sir Menzies Campbell's pre-race tipple
Sir Menzies Campbell, who was one of the fastest sprinters on earth in the 1960s, went on the become leader of the UK's third largest political party, the Liberal Democrats.
He explains here, for BBC Parliament's First Past the Post documentary, the rather unusual food and drink his mother used to give him before his 100m and 200m races.
- Watch the story of the Olympians in Parliament in First Past the Post on Wednesday 25 July at 21:00 BST on BBC Parliament
- Or catch up on iPlayer (UK only)