Some train services through Cornwall will be cancelled or replaced with buses this summer due to the number of rail staff having to isolate.

Great Western Railway (GWR) has said it will be operating a revised timetable from this Monday (July 26) until almost the end of August due to a reduction in the number of available staff.

The company said: "A significant number of staff are having to self-isolate following notification from Test and Trace.

"Where possible customers will be contacted and advised of cancellations affecting their journey.

"Customers wishing to travel can choose to travel on alternative services immediately before or after their booked service or claim a full refund with no admin fee if their service is affected."

GWR went on to warn customers that where services can operate they are expected to be busier than normal, and advised passengers to check before they travel.

It affects services in Devon and Cornwall between this Monday (July 26) until Friday, August 20. The changes are:

Plymouth-Penzance

09:50 Penzance-Plymouth will not run, however alternative services are available

12:17 Plymouth-Penzance will not run, however alternative services are available

Looe Branch

The last train service from Liskeard will be 17:46 and from Looe 18:17. A Rail Replacement Service will then operate the evening timetabled services.

Newquay Branch

16:15 Par-Newquay will be operated by a Rail Replacement Service

17:19 Newquay-Par will be operated by a Rail Replacement Service

Gunnislake Branch

21:30 Plymouth-Gunnislake will be operated by a Rail Replacement Service

22:22 Gunnislake-Exeter will be operated by a Rail Replacement service between Gunnislake and Plymouth with a connecting train onwards to Exeter

Other services affected include in the Bristol area, and the London Paddington-Plymouth, when the following services will not run between Monday (July 26) and Friday August 20:

05:49 Plymouth-London Paddington

17:36 London Paddington-Plymouth

Also affected are the 06:55 Plymouth-London Paddington on Saturdays from July 31 to August 21 and the 19:04 London Paddington-Plymouth on Sundays from July 25 to August 15.