And what the Met are facing is the probability that if they imagined things to be that simple, any FPN could be challenged in the courts by top lawyers who would point out that thanking a workforce for spending many hours beyond the call of duty is essential if management ever expect the workers to do the same again.
I can guess that NHS workers, if not burnt out and looking for other work, will continue to spend hours working beyond the call of duty if another health care crisis arises.
Other workers, in jobs which they don't regard as a vocation, are probably more likely to tell management where to get off, having seen the example first set by Cummings and then Johnson. Not just the parties which supposedly weren't, but the constant running away by him when there is any sort of crisis.