[1] In 1953 she took part in the Fleet Review to celebrate the Coronation of Queen Elizabeth II.

[3] Astute was laid down at Vickers-Armstrongs Barrow-in-Furness shipyard on 4 April 1944, was launched on 30 January 1945 and completed on 30 June 1945.

[5] Astute arrived at Halifax, Nova Scotia on 11 April 1950 for a six-week training period with the Royal Canadian Navy ending on 1 July.

[6] Astute spent 21 months in 1955–56 based at Halifax as part of the Canadian submarine squadron, leaving Canada for the UK on 10 December 1956.

[7] As a response to the Cuban Missile Crisis, Astute and sister ship Alderney, both part of the Halifax-based 6th Submarine Squadron, were deployed to the North-East of the Grand Banks to warn if Soviet submarines were to be sent across the Atlantic to Cuba.