Don't no much about this photo from an old magazine,looks like a parachute drop container,the motorcycle is a 3HW,it has a contract plate on the mudguard tail section which looks like the early brass type,so might be an early model from 1942.

Whoever fitted that sidecar needs some instruction on how to do it...I bet it was a pig to drive... ....Ian

email (option): ian@wright52.plus.com