Simply make more Bren Guns and with chrome linings and sooner. When choosing a domestic SMG take the opportunity to go for something stronger than 9x19mm but weak enough to work as a simple blowback weapon. Say 9x25 as an example. The Mk4 worked fine as a bolt action rifle but a better SMG can make a better fit to a 2 Bren platoon. Forget pistols. Only a comforter and officer identifier to snipers. An easier cocking PIAT would cover many general HE tasks as well as AT and is useable for local indirect fire so could act as a mortar at close ranges down to platoon level. Oh yes; and self heating tins of tea. Add water and pull tab like self heating soup. Also decent sleeping bags. Seriously. The chaps will do better with actual sleep and hot tea on demand without a fire. There is no problem that cannot be solved with hot tea. If you can rustle up some biscuits too that would be ideal.