Source Bayonet Strength website Carrier Platoon - the Bren carrier was an attempt to provide a fully tracked, lightly armoured vehicle, which could transport a Bren gun team across exposed ground and set up a firing position to support the advance of the Rifle Platoons.
In its earliest form the Platoon operated ten Bren carriers, with a HQ and three Sections of three carriers each. Platoon HQ had a single machine crewed by the Platoon Commander, driver-mechanic and batman. Each of the three Sections had three carriers, with an NCO, rifleman and driver-mechanic in each vehicle. The first carrier was commanded by a Sergeant, the other two each by Corporals. Each carrier mounted a Bren gun, and one in each Section also had an anti-tank rifle.
This unit in each British Infantry battalion was used as a firebrigade and/or to provide additional support to an attack - the challenge is what could you do within this structure to increase its suppressive firepower - off the top of my head - Vickers MMG instead of Brens, a Besa instead of Bren (belt fed), twin Vickers K, 20mm cannons (early delivery of Polsten), 15mm Besa, 0.5" Vickers - any other suggestions. I do realize that the 'real' carrier platoon could dismount their Brens but in this AH challenge there is a willingness to sacrifice this flexibility for additional firepower