Engineers have discovered that the fall of the roof of the Apollo Theatre - which is due to open later this week - was caused by the deterioration of Victorian wadding ties which supported the ceiling.
Westminster Council has said that the collapse of the ceiling of the Apollo Theatre in Shaftesbury Avenue last December was caused by the deterioration of century-old cloth and plaster ties holding up timber frames.
The incident during the Curious Incident of the Dog at Night Time injured 80 members of the audience when 10 square yards of plaster plummeted on to the stalls below, and forced the closure of the grade II-listed theatre.
The ties, made of hessian and plaster of Paris, were used to lash together timber frames to support the suspended ceiling and had been in place since the theatre opened in 1901.
The Apollo will re-open this week for the first time since December 19.
The unlicensed events unfolded on Saturday night at Clapham Common and Tooting Bec Common.
A 37 year old man who was taken to hospital after getting into difficulty in a stretch of water near Maidenhead has died.
Jonty Bravery, who is mentally ill, has been jailed for 15 years after throwing a six year old boy from the Tate modern balcony.