15,600 - alleged "spy pay"
18,000 - MOD salary
50,000 - police pension
do not add up to what would be expected to turn someone. Herman was well above middle-class without the 15.6K (police pension looks huge = 4 middle class families).

I think we should indulge ourselves here in the presumption of innocence, until some better evidence turns up - e.g., Swiss bank account, ideology or an admission by Herman.

One wonders if Herman made some enemies when he was a cop ?