Westminster Council have said they are checking but it is unlikely that they would have given permission for the drummers to perform in Soho on Saturday evening. The council is responsible for enforcing noise limits in the area.
"Helen Mirren did a fantastic job of enforcement for us."
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A group of 19 of the original 1978-1982 cast met to watch the musical's West End comeback starring TV's Miranda Hart.
Fire crews were called to the 66-year-old's flat in Leatherhead, Surrey after the fire spread from the disposable barbecue.
The operation carried out by Westminster City Council led to the seizure of £8,000 worth of cigarettes.