Today marks 10 years since the Bali bombings.
202 people, including 28 Britons, were killed in October 2002 when a terror group launched an attack on two nightclubs packed with tourists.
Special ceremonies will be held to mark the anniversary in Bali and in London today.
More top news
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.