First of all, how long have you had your licence and what conditions do you have on it now?
My certificate states: The .308/7.62 & .25-06 Rifles, Sound Moderators and ammunition shall be used for deer and fox control and for zeroing on ranges, or land over which the holder has lawful authority to shoot.
I am slightly confused here, why would you need two rifles? Shooting foxes Whilst stalking deer or not stalking deer coming across a Fox results in the same end!
So what we are saying is you can shoot a fox with your .308 if your intended quarry is deer, however if it is not you cannot shoot a fox!
I think you need to talk to your FEO and discuss this matter further, that's of course I have read your thread right!
ATB
Steyr.308