You know the answer, and so do I, otherwise I would not have asked.
The pensions of civil servants, police officers and others in public office are subject to forfeiture in the event of certain criminal convictions relating to their duties in office, chiefly corruption.
It’s a big stick to keep these people on the right side of the law as they climb the career ladder, gain more power and more to lose - we can thank Samuel Peeps for that.
It’s also a glaring example of precisely why there is no equivalence to be drawn between public and private sector pension schemes.
They come with completely different rules, one can be forfeited for behavior in office, the other cannot.