I am in the process of researching my Uncles medals. I have two pictures of him in uniform- one in BD at his wedding and this one. I was under the impression that he was in the REME.
Have a look at these Glosters in India during the Inter-war period. Gloucestershire Regiment in Jhansi, India, 1928 – Bates and Hindmarch
The photo above would explain the KD uniform (Standard issue for India and Middle East), the lanyards are part of the Band musicians equipment. The photo is dated 1928. Pre WW2 still wearing WW1 kit. REME was formed in 1942. Corps of Royal Electrical and Mechanical Engineers | National Army Museum