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 24-year-old was unarmed and the incident is not being treated as terror-related.
Some platforms have been taken out of service with disruption expected to continue until the end of the day.
The Met Office has extended its weather warnings for snow and ice to cover vast swathes of the country, including London and the South East.