Canadian Commando with a Lanchester SMG. It wasn’t only the Japanese who put huge bayonets on subguns!
I do wonder how awkward it would get to use Lanchester mags, with their 50-round capacity. Notice the front pouches this fellow is wearing – they are a single continuous piece from the lid above his arm to the bottom of the pouch below it. In addition to putting a lot of of-center weight on an already-heavy gun (2.3 pounds of magazine in a 9.7 pound gun), I expect they also hindered movement and bending at the waist when stored in those pouches.