Last-ditch talks aimed at averting a Boxing Day strike by London Underground drivers are being held, with little sign of a breakthrough to a row over pay.
Members of Aslef are believed to have voted in favour of industrial action, although the union has not formally announced the result of its ballot while talks are continuing.
If the strike goes ahead, it will be the third successive Boxing Day walkout by Tube drivers in a dispute over Bank Holiday pay which dates back to an agreement in 1992.
A stoppage would disrupt Tube services in the capital, causing chaos for shoppers, sports fans and visitors.
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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.