Of course you can't judge the height,
And that is, of course the problem the CAA will have had in doing anything about it. I am guessing it wasn't fitted with a Mode C / S xponder - so not too sure how they would be able to tell its height accurately!
And on the subject of the hunt itself - is it possible we could debate this elsewhere (JetBlast, another forum); other than my general mantra of "live and let live," I'm more interested in the aviation related aspects - if any!
Politics and PPRuNE often don't mix nicely!