TFL's London Underground staff are currently striking across the county's capital in a walkout that should last the rest of the day.
The RMT union have called for the strike over fears of changes to staff pensions and job vacancies after TFL have proposed cost-cutting measures in recent months.
London's underground system has already suffered walkouts over the course of the past week. Every line was impacted by a full strike on Tuesday, whilst many lines ran on a reduced service on Wednesday.