Peter Herbert, chairman of the Society of Black Lawyers, has accused Chelsea FC and the FA of a cover-up for not referring alleged comments made by Mark Clattenburg to the police.
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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.