I've recieved the service record of an uncle who was killed in WW2 and am piecing together his service. Pre war he was a TA Sapper and his initial trade was Pioneer Fitter E111. When war was declared he was called out to serve full time & he was re-mustered as an Engine Articifer Group A Class 111. My question is, what did these trades entail? In civilian life he was he was a Mechanical Engineer in a Royal Navy Torpedo Factory. Cheers.