Looking for local Deaths of "William Bullock" on FreeBMD, I think this is the best fit.
Surname First name(s) Age District Vol Page
Deaths Mar 1931 (>99%)
Bullock William 75 Westbury S. 6a 410
I cannot find a corresponding record within the FoD PRs.
You probably know that until 1935 the "W-o-S District" included most of the eastern half of the FoD.
https://www.ukbmd.org.uk/reg/districts/westbury%20on%20severn.html
However the GlosBMD entry confirms this particular record does actually relate to a death in the general locality of Westbury on Severn village itself.
Death Details
Surname Given Names Age Year Died District Register Entry
BULLOCK William 75 1931 Westbury on Severn, Newnham (from 1893) 8 153
Have you traced the whereabouts of his children after 1911 ?. If they stayed local then I expect William did as well.
???
PS Ooops, he is in the PRs, and in W-o-S village itself;
At that time Number 1 was still the old Workhouse building. This prior thread explains
https://forum.forest-of-dean.net/index.php?id=50162
This could of course mean that this particular Williamm Bullock was from another part of FoD, and not our man, as there were a fair few men of this name in the western Forest area....
???
Record_ID: 388541
Entry_Number: 605
Year: 1931
Month: Jan
Day: 19
Surname: BULLOCK
Forenames: William
Residence: 1 High Street Westbury on Severn
Age_at_death: 75 years
Officiating_Minister: A R Smith Assistant Priest
Event: Burial
Cause_of_death:
Memoranda:
Notes:
Register_Reference: P354 IN 1/2
Page_No: 76
Parish_Chapel: Westbury on Severn
Soundex: B420