the 2nd pic is of a G3L
the first pic I cannot see if i has a duplex front down tube frame, if it has its pre 1941, a G3 would have had girder forks but it was common enough to fit tele forks in place of the girders, believe me you wouldn't want to bash a girder-fork bike around a scrambles course
PS when I blow the pic up as far as I can I am not even sure this is a Matchless frame, it could well be quite a bitza; I cant see any side car lug for pre war frame and the down tube angle looks odd where it meets the engine; the comp bike behind is a 250/350 AJS or Matchless,timing cover is AJS style but the logo on the rocker box looks Matchless M.
Bike by the car could be Triumph.possibly Sunbeam
shame no reg nos are to be seen