Hi Philip
I think I have most of the information you require.
First BAM's death is recorded in St Peter Deaths, December 1963 to January 1975 on page 276. I have not looked at the certificate but I have looked at her will and it is marked that she died 31st March 1970.
I could not find a death for JTM so I looked at his Testament but that gave no death details.
Both wills made reference to their sons, John Stuart Marriner and Thomas Douglas Marriner. BAM's will also referenced her sister, Jenna Wingfield Darlot, and her brother Ulick Candy Brown.
I then looked at Applications of evacuees wishing to return to Jersey after the Occupation. BAM's request is DJM201106. It shows that she left Jersey in June 1940 and gave her occupation in both Jersey and Great Britain as a housewife. Her English address was:
Woodston Manor,
Newham Bridge,
Nr. Tenbury,
Worcestershire.
JTM's request is ARA258926. He left Jersey 23rd June 1940 so would have been one of the last to leave before the Occupation. He gave his occupation in Jersey as a "Retired mining engineer, born March 1875". His British occupation was given as "Gardening". No mention of being a Reverend. He was living at Box House, Beaumont whilst in Jersey but gave his British address as c/o Westminster Bank, Lothbury, London. The interesting thing is that his card has written across it in red "Deceased". The consensus is that this means he died before returning to Jersey, otherwise most of the cards would be marked in this way.
I then searched for a John Marriner death in Worcestershire and found a John T. Marriner who died in September quarter 1944 in Tenbury, Worcestershire, volume 62, page 98.
Hope that helps.
Stewart