The captain announced police would meet them in Glasgow and all passengers would have to stay on board until the smoker was found.
Damn' right if I'd been on that flight,
not smoking or otherwise misbehaving, and heard that announcement I would have been more than a little annoyed. (Shades of GO in Italy).
Keeping the whole 'form' in because one (or more) have done something wrong doesn't belong in kindergarten, let alone on an airliner. OK I wouldn't have punched the CC, but why make such an announcement prior to landing ? At the risk of incurring the wrath of the Astraeans here, a less draconian PA might have curbed the smoking without enraging the rest of the load.
Perhaps some changes to be made when emotions have cooled ? Fire at will.