EdSett is more or less right in that treason is the most likely reason for loss of pension.
QR 3140 refers.
However QR 3140 (1) (b) also states;
Service personnel or former Service personnel are convicted of an offence committed in connection with their service as a member of the Armed Forces, including any of the offences listed below, and the Secretary of State for Defence considers that the offence to have been gravely injurious to the defence, security or other interests of the state.
The list of 6 items refers to enemy, war, geneva convention etc but the catch is that (1)(b) says that the offence can include these offences not that only these offences would apply.
The SoS might argue that bringing the RAF into disrupt would be gravely injurious etc. It would thus be up to you and your brief to argue that that the interpretation was wrong. You can be quite sure that this would absorb most of your gratuity if you won and added to your ealier legal bills if you lost.
Best you can do is bend over and smile.