Great Western Railway has said that trains between Reading and London face 'significant' disruption this Remembrance Sunday, advising passengers to travel only if 'absolutely necessary'. 

The train company has issued the warning for the line between Bristol Temple Meads and London, as well as the line between London and South Wales, for this Sunday.

According to GWR, the disruption is due to crew availability, 

It means there will be a significantly reduced and amended timetable on Remembrance Sunday, when tens of thousands of people are expected to travel to London for memorial events. 

In a statement online, a spokesperson from Great Wester Railway said: "Fewer trains will run on these routes, and those that do will be very busy. Services may also be cancelled or delayed at short notice.

"Because of the late notice changes, and the complexity of updating timetable systems, journey planners will not show changes correctly before Sunday morning.

"We're sorry for the impact this will have on your journey."

The train line said it advises customers to 'only travel if absolutely necessary and change plans if possible'. 

If you've already bought tickets for Sunday 10, they are valid on Saturday 9 or Monday 11 November, or you can claim a full refund at http://GWR.com/refunds.