Robert Armstrong, Baron Armstrong of Ilminster

British civil servant and peer

Robert Temple Armstrong, Baron Armstrong of Ilminster, GCB, CVO (30 March 1927 – 3 April 2020) was a British Lord Temporal and former civil servant. From 1970 to 1975 he was the Principal Private Secretary to the Prime Minister. He was knighted in 1978. From 1979 to 1987, he served as Cabinet Secretary under Margaret Thatcher.[1]

The Lord Armstrong of Ilminster

Official portrait of Lord Armstrong of Ilminster crop 2.jpg
Lord Temporal
In office
26 February 1988 – 3 April 2020
Principal Private Secretary to the Prime Minister
In office
Prime MinisterEdward Heath
Harold Wilson
Preceded byAlexander Isserlis
Succeeded byKenneth Stowe
Permanent Secretary of the
Home Office
In office
Prime MinisterJames Callaghan
Preceded bySir Arthur Peterson
Succeeded byBrian Cubbon
Cabinet Secretary
In office
Prime MinisterMargaret Thatcher
Preceded bySir John Hunt
Succeeded bySir Robin Butler
Head of the Home Civil Service
In office
Prime MinisterMargaret Thatcher
Preceded bySir Douglas Allen
Succeeded bySir Robin Butler
Personal details
Robert Temple Armstrong

(1927-03-30)30 March 1927
Died3 April 2020(2020-04-03) (aged 93)
Political partyCrossbench
RelationsSir Thomas Armstrong (father)


  1. "Lord Armstrong of Ilminster : Political Biography – DodOnline". Archived from the original on 7 March 2012. Retrieved 21 April 2017.CS1 maint: BOT: original-url status unknown (link)