Sorry I have only just picked up this thread. I am also related to AC Sallis - also a great nephew. Although it is a year on, did you manage to find the information you required. He was also involved in an accident the previous month, in which he was the only survivor in a training accident near Sunderland. Apologies for talking out of turn, if you would like to get in touch, more than happy share information
Discussions related to the equipment, weapons and vehicles employed during the second world war.