Thank you Mike for the excerpts.
They show it is quite a long and complicated history to get from 2-4 guns to eight (from 1926?) there was some 'backsliding' by some officers.
What was wanted changed over the years and changed back a bit and then back to the original concept/s depending on year and particular officer/s.
It is possible to get quotes showing different things but some of them are not the general trend.
The Sopwith Snark
View attachment 887070
Used two Vickers guns in the Fuselage and two Lewis guns under
each lower wing (recesses for the drums can be seen in the photo) in 1918-19. Unfortunately, the A.B.C.
Dragon engine was an utter disaster that doomed just about every airplane that used it.
The Snark also showed the problems faced by the RAF at the time. They could not mount the Vickers guns where the pilot could not reach them for inflight jams and while the Lewis gun was more reliable it could not be synchronized and was limited to 97 rounds in the drum, not enough for sustained fire.
The Gun situation was not fully resolved even for the first Gladiators which got 2 Vickers guns in the fuselage and a single Lewis under each wing until sufficient Brownings were available.
The guns on the Snark were good for around 600rpm so getting better guns also increased the total rate of fire.