Being involved with WW2 living history as well I have to say the Bren tripod is the most useless piece of kit issued for the bren. They are plentiful on the surplus market and most groups have one. Having been an air defence gunner in a previous life I found them unstable and a menace when trying to track an aircraft with. As to fixed line firing the bren isn't in the same league as things like the GPMG or MG42