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Stephen Mulhern and Emma Willis 9am - 12pm
Tube drivers are being asked if they want industrial action in a row over safety as it's claimed Londoners have suffered what's described as the 'worst week' of disruption.
The RMT says it's not happy with new rules for reversing trains and a lack of staff.
There have been big headaches with signal problems, faulty trains and staffing issues on lines including the District, Circle and Victoria.