Australia Birth Index
Francis William Cosens, born June 27 1918, Queensland, Australia, father William Frederick Cosens, mother Dorothy Capel

UK Incoming Passenger Lists
Departed Sydney, Australia, on the Miltiades, arrived London, England April 30, 1919
Address Sampsons, Tillingham, Essex
Frederick Cosens, Army, age 41
Dorothy Cosens, age 41
Rosa Cosens, age 2
Francis Cosens, age 9 months
[Presumably Dorothy was Kathleen. Did she use the name Dorothy in Australia? The answer seems to be yes as on her daughter’s birth records she is recorded as Dorothy Capel. Did they just record her age the same as her husband?]

In the 1921 census
Sampson Farm, Tillinghan, Essex - Southminster sub district, Maldon district
Head Frederick William Cosens, age 41 years 6 months, married, born London, farmer, employer
Wife Mary Kathleen Cosens, age 42 years 1 month, married, born Great Easton, Essex
Daughter Rosa Frances Cosens, age 4 years 9 months, both parents alive, born Brisbane, Queensland
Son Francis William Cosens, age 2 years 11 months, parents both alive, born Brisbane, Queensland,
2 general domestic servants

UK Navy Lists 1937
Francis William Milton Cosens, Midshipman (probationary), February 1 1937

UK Navy Lists 1939
Francis William Milton Cosens, Midshipman, February 1 1937

UK Navy Lists 1941, 1942
Royal Naval Reserve
Sub-Lieutenants
Francis William Milton Cosens, January 11, 1940

UK Navy Lists 1944
Royal Naval Reserve
Lieutenants
Francis William Milton Cosens, July 11, 1942

Admiralty Fleet Orders
Admiralty, Whitehall, August 15 1944
The KING has been graciously pleased to give orders for the following appointments to the Distinguished Service Order and to approve the following awards:- For gallant and distinguished service in special operations:
The Distinguished Service Cross
Lieutenant Francis William Milton Cosens, R.N.R.
[Note: 1) Wikipedia states -The DSC is "awarded in recognition of an act or acts of exemplary gallantry during active operations against the enemy at sea." and
2) it is for special operations]

THE ROYAL NAVY
2791
M.G.B. [Motor Gun Boat] 179.
Lieutenant, F. W. M. Cosens, DSC 13 Nov 44
R.N.R. (In Command)
[MGB see Wikipedia - https://en.wikipedia.org/wiki/Motor_gunboat]
from https://uboat.net/allies/warships/ship/17535.html
Allied Warships
HMS MGB 179 (MGB 179)
Motor Gun Boat of the Higgins 82 feet-type class
Navy The Royal Navy
Type Motor Gun Boat
Class Higgins 82 feet-type 
Pennant MGB 179 
Built by Higgins Industries (New Orleans, Louisiana, U.S.A.) 
Laid down 21 Aug 1942 
Launched 31 Dec 1942 
Commissioned 17 Oct 1944 
History
Ex American USS PT 215
Returned to the USN on 23 October 1945
and
Technical information
Type Motor Gun Boat
Displacement 46 BRT 
Length 82 feet 
Complement 12 men 
Armament
2 20mm AA (2x1)
4 .5" AA machine guns (2x2)
4 .303" AA machine guns (2x2)
Max speed 42 knots
Engines Petrol engines, 3 shafts 
Power 4050 BHP 

London Gazette August 1944
The Distinguished Service Cross
Lieutenant Francis William Milton Cosens, R.N.R.

UK Navy Lists 1945, 1946
Royal Naval Reserve
Lieutenants
Francis William Milton Cosens, Distinguished Service Cross, July 11, 1942

UK Navy Lists 1949
Emergency Officers
Lieutenants
Francis William Milton Cosens, seniority July 11, 1942, transfer December 20, 1947
[interestingly no D.S.C. listed]

In the March 1995 death index Francis William Cosens, born June 27 1918, died age 76, Chelmsford, Essex, register F25, district 4682, entry 165

National Probate Calendar
Francis Cousins of Tall Trees Nursing Home Oaks Place Mile End Road Colchester
Died 9 May 1995 Probate Ipswich 21 August 1995. 165 263 pounds

Findagrave.com
Francis Cousins
Birth unknown
Death unknown
Burial Colchester Cemetery and Crematorium, Colchester, Colchester Borough, Essex, England
Memorial ID 79156594