His Majesty's Stationary Office (HMSO) Catalogue - Glossary Item 'Naval Convoy System'

Name	Naval Convoy System
Description	A group of vehicles traveling together for mutual support and protection. A convoy is often organised with armed defensive support. The British adopted a convoy system for almost all merchant ships, the moment that WW2 was declared.

Name	Atlantic Bridge, The Official Account of R.A.F Transport Commands Ocean Ferry
Category	Merchant Seamen
Issued By	Ministry Of Information
Issued For	Air Ministry
Published	Feb/1945
iTunes	Available

Name	The Battle of the Atlantic, The Official Account of the Fight Against The U-Boats, 1939 - 1945
Category	Action at Sea
Issued By	Central Office Of Information
Issued For	none
Published	Oct/1946
iTunes	Available

Name	The Mediterranean Fleet, Greece to Tripoli. The Admiralty Account of Naval Operations: April 1941 to January 1943
Category	Action at Sea
Issued By	Ministry Of Information
Issued For	Admiralty
Published	Sep/1944
iTunes	Available