Bevil Grenfell Heslop was born at the Rectory, Clyst St Mary, Exeter, Devon in 1913.  He was the son of the Reverend Prebendary Gerald Lowndes Abbott Heslop MA & Mrs Maud Sweetland Heslop.  

He joined the Royal Navy as a naval cadet in May 1927 and by 1 January 1931 was serving in the Battleship HMS RODNEY.  On 18 August 1931 he was appointed to the Cruiser HMS KENT.  He was promoted to Midshipman on 1 September 1931 and to Acting Sub Lieutenant on 1 January 1934.  

Sub Lieutenant Heslop was appointed to HMS DOLPHIN for the Submarine Course on 29 April 1935 and served in HMS L26 before joining HMS SEAHORSE as 3rd Hand on 20 October 1936.  Promotion to Lieutenant followed on 1 July 1937 and on 7 November 1938 he was appointed to the Submarine Depot Ship HMS MAIDSTONE.  This was followed by an appointment as First Lieutenant of HMS SNAPPER on 15 August 1939. 

Bevil Heslop was awarded the DSC (London Gazette dated 9 May 1940) In recognition of ‘daring, endurance, and resource in the conduct of hazardous and successful operations in submarines against the enemy’.

He successfully completed his Commanding Officers Qualifying Course in 1940 and was appointed in command of H32 on 20  February 1941 remaining there  until 3 September 1941.  

He was appointed to the ex-USN HMS P511 in command on 4 November 1941 and brought the submarine back to UK from the USA.  After arrival in home waters the Submarine was accidentally grounded in Lough Foyle on 5 December 1941.  He continued to serve in P511 until 11 January 1941 and then appears to have returned to General Service with an appointment to HMS PRESIDENT and on 10 March 1942 to the Battleship HMS ANSON.

 After 19 months, on 18 November 1943, he joined HMS CAPEL in Command.  HMS CAPEL was torpedoed and sunk NNE of Cherbourg, France by the German submarine U-486 on 26 December 1944.  

Bevil Heslop was unmarried and is commemorated on the Portsmouth Naval War Memorial on Panel No 81 Column No 1.