More than odd
Strake, your question went unanswered.
Is this a matter of PROFESSIONALS closing ranks?
The entire cabin crew books off crook.
But passengers are uninjured and BA says "no hard landing recorded".
I would suspect that the cabin crew may have been making a statement - possibly as some nebulous "final straw" was broken.
But we will probably never know the real nature of that straw.
I'd also be interested to know if any disciplinary action arose out of this, and I'm talking about the cabin crew, not the flight crew.