Thousands of families faced huge disruption today, as schools closed right across the capital. Teachers from two unions walked out in an ongoing battle over pay and conditions.
As they marched on Parliament to protest to the Government, parents were forced to make alternative arrangements for their children. Luke Hanrahan reports.
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Tubes, trains, trams, buses, cable cars, river buses, taxis and going by foot - your guide to getting around during the strike.
Union officials rejected a revised offer from Underground managers during a meeting at the conciliation service ACAS this afternoon.