Unfortunately with public house trade down [due to stay at home drinkers] and the ever-increasing pressure on housing in the capital, demolition of this nature is sure to increase.
The fact that developers must have known that plans were afoot to get the pub grade II listed, and that it was loved by the local community, just makes their actions more vile.
I have no doubts that they will just get a little smack on the wrist fine [something they will have known/accepted ahead of time] and housing development will go ahead anyway. It would be ridiculous to try to make them put things back as they were.
The only way to prevent this type of situation happening in future is to have a law that forces any such wrongdoers to hand over ALL profits from any such developments to English Heritage.
That and a ‘hit squad’ of activists that can bus it around to any disputed locations, to lie in front of bulldozers in the best Hitch-hikers Guide to the Galaxy style?