Downton Abbey star Laura Carmichael, who plays Lady Edith, is making her West End debut alongside Anna Friel in a production of Uncle Vanya at the Vaudeville Theatre.
Our correspondent Lucrezia Millarini went along to meet her:
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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.