The England births and 39 Register drew a blank
There's an unmarried schoolmaster, born 16 September 1906, in the 1939 Register in Enfield, who could be John George Sutherland born in Poole and registered in the December quarter in 1906.
Also a death of John George Sutherland, born 16 September 1906, in Hampstead in the June quarter of 1977.
Clutching a bit at passing straws, it occurs to me to wonder who would have been walking alongside rather than harnessed to the gin

carriage. Surely any such men would have been officers or petty officers, in which case would their rank not have been listed? If JGS' rank wasn't mentioned, would it not be reasonable to assume that he was a rating or AB and not an officer, and therefore young rather than middle aged?