RAIL union RMT reiterated its call for Govia Thameslink Railway (GTR) to be brought into public ownership after chief executive Charles Horton announced his resignation today over severe service disruptions.

The company said Mr Horton will remain in post for a short period to oversee the development of a temporary timetable to address the recent travel chaos, with GTR cancelling hundreds of daily journeys.

The timetable changes, brought in across several franchises at once, have proved problematic, with a severe shortage of drivers on Thameslink in particular.