Good evening,
Hard to give a definitive date but post WW2. He is wearing 1938 pattern battledress, has medal ribbons and two long service and good conduct stripes.
Do you have a date for the marriage, hopefully between 1946 and early 50s which would fit with the above.
John915
Added; the good conduct stripes were for 2 and 6 years service with no blemishes on his records.