Virgin are saying it was the worst such incident in its 22 years history indicate the severity of the situation.
Perhaps this incident will make airlines review their seat belt policy. I cannot count the number of times I have travelled as a passenger and found both the passengers and cabin crew ignoring the sign. I sometimes wonder what the CC think the report "Cabin Secure" really means.
My understanding of the law is if the seat belt sign is "on", secure the passengers and cabin, then sit down and strap yourself in. Stop passengers from leaving their seats.