GWR has announced that an upcoming shortage of train crew is going to affect its services. 

The train company has confirmed that an amended timetable will be running on Sunday (July 14) as a result.

It added that short-notice cancellations and alterations would be likely on trains between London Paddington and Bristol, London Paddington, Swindon and Cheltenham/Gloucester and Bristol Temple Meads and Exeter/Plymouth. 

It added that trains between Paddington and South Wales would continue to be diverted because of ongoing engineering routes. 

Timetables will be updated from Sunday morning. You can check your journey at http://GWR.com/Check

More information on obtaining compensation and refunds can be found in the help section of GWR's website. 

A spokesperson for GWH said: "This could mean only a train every two hours on these lines, and other routes will also be affected.

"To help customers, tickets for Sunday, July 14 will be valid on Saturday 13, or Monday 15. 

"If your train is cancelled, you can use your ticket on the next available service."