TBM,
The guff around TyTAN (the IOS for Typhoon) noted that the extra Sqns were being generated through efficiencies enabling the rest of the Sqns to be 'around 12 jets'. Not sure if this is still the case…
“We will be extending the life of our multirole Typhoon for 10 extra years through to 2040, meaning we will be able to create 2 additional squadrons. This will give us a total of 7 frontline squadrons, consisting of around 12 aircraft per squadron.”