Thank you Neal
You are right my Grandfather according to his army record started out in the territorial reserves , he enlisted in 1925 HLI 6th bn, he finished his army career with the pioneer corps in 1945.
Thankyou for the information about the uniform and army summer/ weekend camps this gives me bit more clarity on why my grandmother and baby were there.
It is interesting that you say the photo/baby may be dated late 1930 around march time , if this is correct the baby must be my father as he was born march 1938 .
I have used google to try and understand army terminology and abbreviated terms to help me build a picture of my grandfathers army life.
Thankyou once again, your information has been very helpful.