Yes, I know all that. I am English. That wasn't my point at all. I know it refers to a policeman but which one? The phraseology suggests there is only one policeman, involved, so does this mean the policeman involved in the original flashing incident turned up at the interview for a shotgun certificate?

However, the main thing I didn't understand was:
Perhaps the chorus of people who claim to find the post crystal-clear can explain this to me? I don't just mean a wild guess at one it means, but can you please parse it as it actually stands, with reasonable allowance for "British idiom"?

And just in case anyone is confused, the second quote above isn't by the same person as the first one, it is by the OP.