Hi ness
Noted on the BDM site that of the Martins who had died in October of 1944, four of them had consecutive ref numbers. This would suggest these are the four you are looking for
1944/29853 Martin Mona Mary 63Y
1944/29854 Martin Elias 63Y
1944/29855 Martin Esme Mona 34Y
1944/29852 Martin Reginald Willfred 31Y
One imagines a coronial inquest was probably held and the record of this might be with National Archives, though the record of one was not immediately apparent on their website.
Cheers
Alan