Question to the Department for Transport:

To ask the Secretary of State for Transport, what proportion of Southern trains have operated without an onboard supervisor in each month since guards were discontinued.

In January 2017, Southern launched the on-board supervisor on routes where the technology allows the driver to control the doors. The conductors on these services were moved to an on-board supervisor (OBS) role. Since then approximately 1.3% of these services have operated without their rostered on-board supervisor for the full journey. This only happens in certain exceptional circumstances such as staff sickness or the second staff member running late.