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[Doc Vernon]

If his CRS10 still exists it should be found in the Archives here

Messenger E C to Metrustry N G | The National Archives

Reference:	BT 382/1216
Description:	Messenger E C to Metrustry N G
Date:	1941 Jan 01 - 1946 Dec 31
Held by:	The National Archives, Kew
Former reference in its original department:	1195
Legal status:	Public Record(s)
Closure status:	Open Document, Open Description

Print transcription

First name(s)	John Henry
Last name	Messenger
Birth year	1880
Age	61
Death year	1941
Death date	27 Aug 1941
Number	-
Rank	Able Seaman
Unit	S.S. Tremoda (London)
Regiment	Merchant Navy
Grave reference	Panel 110.
Cemetery or Memorial	Tower Hill Memorial
Burial country	United Kingdom
Additional information	Husband of Gertrude Messenger, of Streatham. London.
Link	https://www.cwgc.org/find/find-war-dead
War	Second World War, 1939-1945
Record set	Commonwealth War Graves Commission Debt Of Honour
Category	Military, armed forces & conflict
Subcategory	Second World War
Collections from	Great Britain, UK None

sorry for repeats just that it comes up on the site I use
Cheers