Around 500 passengers had travelled on the Empire Windrush from Jamaica, in response to job adverts in their local papers, to help plug Britain's post-war labour shortage.
But news of their imminent arrival prompted some alarm within the civil service and even questions in parliament.
Those without anywhere to stay were housed in a deep air raid shelter under Clapham Common, and it's thought that may be the reason that many came to settle in nearby Brixton - as the nearest labour exchange was in Coldharbour Lane.
Many of those on board the Windrush had only intended to stay in Britain for a short period of time, but 65 years on its clear the 'Windrush generation' and their descendants have become an integral part of London life.
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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.