Fast trains between Didcot and Oxford, and Paddington and Oxford are cancelled. Stopping services are running every 30 minutes.
Flooding between Swindon0Bristol Parkway is causing delays of up to 15 minutes between London Paddington and Cardiff Central. Updates soon.
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The show is on a nationwide tour before it arrives in London.
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A statement from McPartlin's publicist confirmed that this week's Saturday Night Takeaway will no longer run.