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South West train operator GWR has issued a warning to travellers as temperatures in Britain are set to reach record-breaking highs this week.

GWR urged people to only travel if "absolutely necessary" on Monday and Tuesday (July 18 and 19) as the country's first-ever red heat warning comes into effect in much of England.

Temperatures are forecast to hit up to 41°C this week, with rail operators, including GWR, warning journeys could be longer - and disrupted. People are being advised to check journeys before they travel.

Network Rail said it had assessed the impact of the extreme heat on the railway infrastructure and it would be introducing speed restrictions to ensure the "safe running of trains".

"GWR services are expected to be significantly impacted and those trains that do run will be extremely busy. Journeys will take longer and there is a high likelihood of cancellations, delays and last-minute alterations," a spokesperson for GWR said.

"Passengers who choose to travel are being advised to check their journeys and ensure they are well-prepared for the extreme conditions – wearing cool clothes, taking handheld fans and ensuring they have plenty of water to drink."

GWR said it would allow people with tickets for travel on its services on Monday and Tuesday to travel on Wednesday and Thursday instead.

Train passengers who are delayed may be entitled to GWR's 'Delay Repay' compensation if they are delayed by 15 minutes or more. Season-ticket holders can apply for compensation through the Delay Repay scheme.