We were about half an hour into the spectacular Fuerzabruta performance, when one of the big vertical acts - a sail likestructure with two performers on top - collapsed into half of the audience.
It was hard to work out what had happened at first, but we were quickly ushered out and it was clear something had gone very wrong.
Luckily, it sounds like there were no serious injuries"
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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.