RE: Fireflies in Game
There was an offline discussion of this scenario and tank units also, tonight. For the British/Commonwealth, I don't think they had any platoons that are all Fireflies. So if you see a single tank in the image (assuming enemy), it is a 75mm Sherman. If it has the 2 tank image, then it is 3 75s and 1 17 pdr/Firefly. If you have the British units, I judge their type by looking at the HA rating - 18 means the unit is all 75mm, higher means it is the 3+1.
The Sherman Vs are regular 75mm versions.
In that discussion, we determined there was one unit (HQ I think) mislabeled as to the type, as it would indicate it was a Sherman with 76mm gun, but my understanding is the British didn't use many if any 76mm Shermans.