You get paid during a notice period under the proviso you are still doing the job until that period ends.
It's not possible to argue that H&M were still working royals after they left for Canada.
How is it not possible to determine they were working royals considering they were doing the same zooms as everyone else.
You're right that H faces challenges as a result of his heritage wrt security, but by the same token that doesn't give him the right to make unilateral choices without consequences, especially when the cost of those choices are born by the taxpayer.
The key issue with security was the ability of the Met to provide it overseas. Something they decided was not feasible.
When did the Met decided this is not feasible? From what I could gather, the Met said the risk is still the same. What I got from that was that the RF would not sign off on it. The Met have never said anything about not being able to provide security, as they do provide security in general overseas for other workers and diplomats etc.
As I said previously, during scrutiny meetings, the Met would need more than H's signature that he must be provided with security, they need the palace to do this.
But, the Met is not even the main issue here, they are not complaining about the Met not providing security per se. If that is the decision, it must be put down formally and clearly. PC, however should help with security, and by cutting funds, he was putting their lives at risk as he knew they were still starting out on trying to be independent at that point.
You also state :
As for H, the money he and W revived annually from the Duchy of Cornwall (circa £2m plus p.a.) was not "pocket money" do do with as they please.
It's purpose is specifically to cover the costs of being a working royal. So for example, staff salaries, running an office, social media management, travel etc.
The money is not 2M, as it's divided into 3. W,H and other things. We have no idea how much, and CH could have told us the amount - which I believe H would have been able to tell us what it went into. Which could well mean it's for paying out and closing down the office as you stated what it's for. So PC would have known there is no money for security left, because with all those costs, I highly doubt it was anywhere near 2M. Clever of CH to lump 4.4M together like that.