Simon succeeded to the viscountcy upon the death of his father in 1993 and became a member of the House of Lords.

[1] Lord Simon was President of the Driving Instructors Association from 2000, and of GEM Motoring Assist from 2004.

Simon was married to Mary Elizabeth Burns from 1969 until her death in 2020.

[2] They had one daughter:[3] Lord Simon died on 15 August 2021 at the age of 81.

[4] As he had no sons and as there were no other surviving male line heirs of the first viscount, the viscountcy became extinct upon his death.