Will the government hold their line on strike action?

Today begins a chaotic week for commuters who face major travel disruptions as rail staff stage the biggest walkout in 30 years. Union leaders have accused the government of 'inflaming tensions', as Grant Shapps has refused to negotiate with the unions over pay, conditions, job cuts and safety.

Also on the podcast, what could be the outcome of Thursday's two by-elections?

Isabel Hardman is joined by Katy Balls and James Forsyth.