Please see below the latest update from Great Western Railways:
"From Monday (11 January) in addition to the changes already in operation we will be reducing the frequency of off peak services between Bristol Temple Meads and London Paddington.
The changes will help protect services vital for key workers and essential travel, and will mean we continue to operate approximately 80% of our planned timetable.
We will be directly contacting customers who have booked online with us to offer advice and help to switch to other services, or to claim refunds. We are also reminding customers who need to travel to check timetables on https://www.gwr.com/travel-updates/check-your-journey before they set out.
We will be keeping the timetable under review, particularly given the new national lockdown in England and will work with the Department for Transport on any further changes."