The Temperate House at Kew Gardens was due to shut because of its deteriorating state. However, multi-million pound grants from the Heritage Lottery Fund, Department for Environment, Food and Rural Affairs and private donations means a five-year restoration scheme can now go ahead.
The 150 year-old Grade 1 listed building is home to the South African Cycad and the Chilean Wine Palm, the world's tallest glasshouse plant.
Martin Stew spoke to the Head of Glasshouses at Kew Gardens, Greg Redwood.
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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.