I have no detail knowledge of the light tanks but normal British practice was that the fan extracted air from the turret so was normally placed as close as possible to the gun. Fresh air that replaced that extracted would then carry any fumes towards the fan, thus concentrating and then removing them.
Regarding the replacement of Scorpion turrets, this was done to take them out of the count of British tanks when we were agreeing to a reduction in our forces under the CFE treaty. Fume build up could have been solved with fans etc.
The Foxes were taken out of service because people kept rolling them - they are great fun to drive !
David
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