The photo shows the front of the Post Office Knightwick. Gordon was born in 1927, so I guess that if he was about 10 years of age that this would be circa 1937-38.
Mum and Dad (Doris Eliza Jones and John Edward Holland) married in 1938. Mabel, (Gordon's second cousin), would be circa 30 years old
and my dad, (Gordon's uncle by marriage), would be circa 29 years old.