Workers at the Olympic Stadium have begun installing the set for the London 2012 Opening Ceremony.
Titled "Green and Pleasant", the scenery depicts a traditional and idyllic view of the British countryside, with a patchwork of green fields, meadows and rivers.
Real farmyard animals will feature in the production, including 70 sheep, 12 horses, 10 chickens, 10 ducks, nine geese, three cows, three sheep dogs and two goats.
Artistic Director Danny Boyle (of Slumdog Millionaire fame) says the Opening ceremony "is not a pop concert". Instead, he is trying to make it feel "like you are watching a live film being made."
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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.