So sad it came to this.

[Voxpop]

reduction of pension/forfeiture

Here is what the scheme rule says:

J.5 Events enabling forfeiture
(1) This paragraph applies to a member who is an active member, a deferred
member or a pensioner member if the member—
(a) is convicted of treason or one or more offences under the Official Secrets
75
(a) 1826 (7 Geo 4 c. 16)

Acts for which the member has been sentenced on the same occasion—
(i) to a term of imprisonment of at least 10 years; or
(ii) to two or more consecutive terms amounting in the aggregate to at
least 10 years;
(b) is convicted of an offence in connection with the service that qualifies the
member to belong to the Scheme which the Defence Council considers to
have been gravely injurious to the defence, security or other interests of
the State; or
(c) has after becoming a member of the Scheme incurred a monetary
obligation to the Crown which—
(i) arises out of a criminal, negligent or fraudulent act or omission by the
member; or
(ii) arises out of or in connection with the member’s service in the armed
forces.
(2) This paragraph applies to a person who is convicted of the murder or
manslaughter of the member or any other offence which involves the unlawful
killing of the member.
(3) In paragraph (2) “unlawful killing” includes unlawfully aiding, abetting,
counselling or procuring the death.


Looks like J5(1)(c) is what the powers that be will be addressing their minds to. As others have said, pensions are not reduced without a good deal of consideration at a very senior level.