Justine Greening, MP and Secretary of State for the Department for International Development was one of the first people to try out the latest Jaguar XFR-S - on the same day she checked in her old Golf for its latest MOT.
Generally she's all in favour but apparently "hayfever sufferers should take particular care: a violent sneeze could easily pit 10 mph onto your speed."
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The high of 35C was recorded on a Bakerloo line train between Piccadilly Circus and Oxford Circus at 2pm.
Weather forecasters say temperatures could reach 35C, beating the previous record of 34.6C in the scorching summer of 1976.
After years of political manoeuvring over the future expansion of Heathrow Airport, there has been an important development this lunchtime.