The drummers who disrupted Helen Mirren's performance on Saturday at the Gielgud Theatre have said they had permission from Westminster Council to perform in the street.
The Batala London group was performing in Soho to promote a festival in East London, before they were cut short by Dame Helen's intervention.
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The capital's theatres also generate more searches than those in any other city, according to research by Google.
Union officials are expected to meet next week to plan further stoppages if talks fail to resolve the dispute.
Natalie Sharp and Christine Bicknell appeared in court over an alleged incident at a Lidl superstore in Wallington, south London.