RSM of 3 Commando RAC John Duncan Allen awarded George Medal in July 1943

[Sc00p]

.... in 1949. At the time he was married with 5 children...

Babel, Just a small observation here... He may not have been married in 1949 unless Mildred bigamously married John F Loben 3Q 1947 Colchester.  That marriage would appear to be shortlived though as her 1939 register entry has been annotated with a NR230 code reverting her to the surname of Allen dated 27-Apr-1949.

Apologies if you knew this but maybe it adds some context to John's mysterious disappearance.

Is the burial register or electoral register available?

MollyC, Burial registers are on FindMyPast, Familysearch & Ancestry. I've had a scan through and there are no obvious Helens.  A picture of the Liskeard memorial would be really handy.

[Babel]

Thank you Sc00p re the mention of Mildred E. Allen/Wardley marriage to John Francis Lobel in 1947. I was aware but welcome very much your input. Details re the circumstances of the parting of Mildred and John Duncan Allen (whenever that occurred) is complicated by a) the difficulty in my finding any divorce details of either of her two marriages and b) in my knowing that a child was born to a mother named Wardley, (I think in Bradford) in Yorkshire in 1946 i.e. a son Noel C Allen. Bradford Yorks was Lobel's birthplace and family home. The cynic in me suggests that this probably provides in part, a reasonable cause for the Mildred-JD Allen break-up. British divorce data is seemingly most difficult to obtain. I live in Australia, and by comparison, is a straight-forward process here. Part of the solution to discovery of data, is of course the purchase of relevant BMD certificates from GRO.

[MollyC]

In FreeBMD the Allen/Wardley birth was registered in Sheffield, Yorkshire, not Bradford.  There was a previous birth in Sheffield in 1939 and a marriage in Sheffield in 1935.
The last Allen/Wardley birth in Colchester was registered in SepQ 1945.  Noel C was registered in MarQ 1946.  It looks like a different family.