LIVE: Roads melt and trains axed on UK's hottest ever day in July
Rail operators have urged customers not to travel and to expect cancellations in the scorching temperatures today.
Key points:
- UK set for record-breaking heat as temperatures forecast to hit 39C (102.2F)
- Britain's hottest ever day in July after temperature reaches 36.9C at Heathrow Airport
- Heat may spark thunderstorms triggering flash flooding
- Rail operators urge customers not to travel and to expect cancellations
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