The front of the Bren's trigger guard should align just about with the rear of the magazine, thus the entire trigger assembly and pistol grip should be drawn further back and be completely visible in the picture.

Both the Cromwell and the Firefly here have the same gun. The OQF 17-pounder gun

Brian2170 said:

Both the Cromwell and the Firefly here have the same gun. The OQF 17-pounder gun

Cromwell here probably has the 77mmHV, which is still wrong since it was for the Comet.