Great Western Railway is advising customers to check their journey tomorrow (Sunday) before leaving home because of a shortage of train crew.

With fewer people available to work, GWR is warning of short notice cancellations and alterations, especially on long distance services between London Paddington and Bristol Temple Meads.

The Penzance to London Paddington journey is one the key routes on the Cornish mainline and a particularly popular way of getting to and from the capital for those living in and visiting Cornwall. 

GWR has warned that journey planners and other industry systems will not be correct until the early hours of Sunday morning, as it works to supply staff to as many trains as possible.

As a result customers are being warned that they will need to check their journey on Sunday morning, to see if their train is still running.

A GWR spokesperson said: "If your train is cancelled you can use your existing ticket on the next available service."

Rail replacement buses will operate on the Kemble line between Swindon and Gloucester.

The company said it predicts the staff shortages to only be an issue on Sunday, with the spokesperson adding: "GWR expects to run a full level of service on Monday, June 17."