Wendy Swan1
- [S466] Notices, The Telegraph, London, UK. Hereinafter cited as The Telegraph.
George J. R. Clark1
Children of George J. R. Clark and Alexandra Rose Little
- Arthur William Byron Clark1 b. 5 Feb 2015
- Willa Rose Clark1 b. 4 Feb 2017
- [S466] Notices, The Telegraph, London, UK. Hereinafter cited as The Telegraph.
Sir John Allen Clark1 

Sir John Allen Clark was born on 14 February 1926.1 He was the son of Sir Allen George Clark.1 He married, firstly, Deirdre Waterhouse in 1952.1 He and Deirdre Waterhouse were divorced in 1962.1 He married, secondly, Olivia Pratt in 1970.1 He died in 2001.1
He was educated at Harrow School, Harrow, London, England.1 He was chief executive of Plessey.1 He was appointed Knight in 1971.1 He was director of International Computers Ltd.1 He lived at Redenham, Hampshire, England.1
Child of Sir John Allen Clark
- [S466] Notices, The Telegraph, London, UK. Hereinafter cited as The Telegraph.
- [S140] National Portrait Gallery, London, online http://www.npg.org.uk. Hereinafter cited as National Portrait Gallery.
Arthur William Byron Clark1
- [S466] Notices, The Telegraph, London, UK. Hereinafter cited as The Telegraph.
Willa Rose Clark1
- [S466] Notices, The Telegraph, London, UK. Hereinafter cited as The Telegraph.
Deirdre Waterhouse1
From 1952, her married name became Clark.1
- [S466] Notices, The Telegraph, London, UK. Hereinafter cited as The Telegraph.
Olivia Pratt1
From 1970, her married name became Clark.1
- [S466] Notices, The Telegraph, London, UK. Hereinafter cited as The Telegraph.
Sir Allen George Clark1 
Children of Sir Allen George Clark
- Sir John Allen Clark+1 b. 14 Feb 1926, d. 2001
- Michael William Clark+1 b. 7 May 1927, d. 27 Jul 2010
- [S466] Notices, The Telegraph, London, UK. Hereinafter cited as The Telegraph.
Byron George Clark1
Child of Byron George Clark
- Sir Allen George Clark+1 b. 1898, d. 1962
- [S466] Notices, The Telegraph, London, UK. Hereinafter cited as The Telegraph.
Shirley MacPhadyen1 
From 1955, her married name became Clark.1
Children of Shirley MacPhadyen and Michael William Clark
- Duncan A. Clark+1
- Miranda Clark1
- Marion Clark1 d. b 2010
- [S466] Notices, The Telegraph, London, UK. Hereinafter cited as The Telegraph.