"Did not play out as you describe"? I agree with your account, Ken; in what way does it contradict what I said?
It's a long time ago, but to the best of my recollection there was no complaint about low flying. What I am sure of is that is that the CAA concluded that there was no flying offence.
For Al R, it's worth noting that there were no passengers on board, and there was no suggestion of the aircraft being "thrown around".
As to proportionality, you are right, it could be argued for ever.