It isn't really believable in any way.
During covid I was part of a food hub that was set up, by some ex-army people. There was a rather nasty robbery from a foodbank at the beginning and so it was decided that it would be kept very quiet where we were and what we had so not to draw attention to us.
We had various ex-army people on the door and about, but when a white van drew up and the chap got out and started peering through windows, a couple of the army chaps went into combat mode and surrounded him very quickly.
He was a reporter, hoping to do a piece on the local food hub that had appeared out from nothing <his words>. Let's just say he left very thankful that he still was in one piece, showed his camera to prove he'd taken no photos and promising that he wouldn't post anything unless he was given the go ahead - and he didn't!
That would be the response I would expect from their security guys if they were there.
When I was at school now 40 years ago, I can remember the head going out to have a conversation with someone who seemed to be hanging about suspiciously (turned out they couldn't find where to read the water meter or something).
That would be the response from the school... if it happened. Unless of course they're hoping to scare the Hamlets off.