A Heathrow Express spokesperson, said:
“93% of our passengers are satisfied with the Heathrow Expressservice which is a 3% increase since Spring 2012. We have spent £15 million pounds on upgrading the Heathrow Express fleet since May 2012 and have improved passenger information on board, online and on mobile devices. We are continuing to invest in improving all aspects of customer service.”
More top news
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.