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On beginning his apprenticeship, Nicholas' first pay-packet for doing a 48-hour week was 49p.
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Nicholas is a leading member of entertainment industry charity The Grand Order of Water Rats, as well as being honorary chairman of the International Quizzing Association.
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Between 1988 and 1991, Nicholas was appointed Rector of the University of St Andrews (a role which is chosen by the students of the university).
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Nicholas was originally offered a larger role in his film debut Master Of Bankdam, that of Lancelot Handel Crowther. However, due to other work commitments, he had to take a lesser role.
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Nicholas was originally chosen to play the Gamesmaster in the Channel 4 video game show of the same name. However, the application of the facial distortion techniques- as the character was partially digitised- did not work properly, so Patrick Moore was chosen instead.
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Nicholas is one of two actors who appeared as a guest panelist on the game show Cluedo, before taking a role as one of the six suspects in a later series- he appeared in the Season 3 episode Murder In Merrie England (with Lynn Faulds-Wood) before taking the role of Reverend Green in Season 4. The other actor to do this is Leslie Grantham.
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Nicholas was guest 'castaway' on the long-running BBC Radio 4 show Desert Island Discs on November 4 2007. Amongst his chosen pieces of music were 'Just One Of Those Things' by Ella Fitzgerald, Chopin's Minute Waltz and 'The Age Of Aquarius' from the stage musical Hair.
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On July 5, 1994, Nicholas took the role of the Narrator for the 21st Anniversary Night performance of The Rocky Horror Show.
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Nicholas has recorded a commentary for the DVD release of the Doctor Who story The Curse Of Fenric, alongside Sophie Aldred and Sylvester McCoy.
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Nicholas can be heard on the 'Twenty-Fifth Anniversary Live Recording' of The Rocky Horror Show as the Narrator, opposite Jason Donovan.
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Nicholas' charity work includes a long association with the Lord's Taverners and he is a patron of DeafBlind UK, The Spring Centre, The Stammering Association and Aspire as well as supporting The Variety Club, Childline and the NSPCC.
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In 1994, Nicholas published his autobiography entitled The Straight Man: My Life In Comedy.
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Nicholas was asked to stand for the Liberal Party (the forerunner to the Liberal Democrats) in Yeovil in 1976. He regretfully refused and instead Paddy Ashdown- who would go on to lead the Liberals in the 1980s- became the candidate and went on to win the seat.