Friends have been paying tribute to a 22-year-old man, who died after he was hit by a train following a row at a railway station.
Ryan Harrison became involved in a confrontation with a number of other men at Guildford Station late on Saturday night.
Police are questioning three men on suspicion of murder.
Det Chief Inspector Iain Miller spoke to Ronke Phillips.
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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.