The question must be asked "if the aerodrome does not operate H24 why is the ATZ notified active H24?" If it were a civil aerodrome the operator would be restricted to ATZ hours that are coincident with the aerodrome operating hours. Why should MOD be any different?
There are some non H24 MOD aerodromes that restrict ATZ hours, why not all?
The current state of affairs is not Flexible Use of Airspace (FUA), something that MOD tell you that they subscribe to.