Hi Bessingby
For the first Chindit op. each Column had attached to it a party of Royal Engineers & Commandos who were trained in demolition practices.
Some of these guys were from either 142 Commando Company, or had been staff at the Jungle Warfare Training School at Maymyo.
The Royal Engineers would have undergone their own RE training at Chatham upon joining, prior to being assigned to their own unit. This would have been prior to the Chindit Ops.
I believe that this is what occured with the chap above, he underwent his RE training in 1937, prior to the war.
Pete