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As many as two thirds of schools could close on Wednesday according to the government - as teachers strike in the row over pensions.
As many as 3 million workers could go on strike in what promises to be the biggest trade union mobilisation in a generation.
Airport operator BAA is warning of 'gridlock' when immigration officers walk out. BA and Virgin passengers are being told they can rebook their flights for free, so they don't have to travel during strikes.
Union members are planning to march in Leatherhead, Hastings, Brighton & Hove, Worthing and Horsham
As many as 10,000 expected in Brighton and Hove