Possibly of no help, but is there some significance in Norman not being on the electoral roll in 1937.
It’s not like a census, it suggests to me that a decision was made that Norman was no longer a part of this household, rather than not being there the day the form was filled in
Mike
The death of Eric Simms (Normans brother) following a riding accident is reported in the Bucks Herald 10 Mar 1939 along with a list of family mourners present at the funeral conducted at Quainton parish church....
"The family mourners included Mr, and Mrs. J. Simms, father and mother ; Mr. M. Simms and Mr. G. Simms, brothers; Mr. and Mrs, T. Midgeley and Mr. and Mrs. N. Curtis, brothers-in-law and sisters; Miss R. Simms, sister, and Mr. A. Cooper, brother-in-law."
Assuming "M. Simms" is John Mornington Simms then Norman is the only family member not present at his brothers funeral