John Doyle, Jubilee line general manager for London Underground: said:
“The unions have informed us that they are in dispute with us over what they perceive as a breakdown in industrial relations. We are keen to understand their concerns and so will be meeting with the unions later this week to discuss these issues in greater detail.”
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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.