Londoners in bathing suits taking advantage of a heat wave at Hyde Park lido, 3rd June 1933. (Photo by Topical Press Agency/Getty Images)





Children playing cricket in a street in Millwall, east London, UK 15th August 1938. A liner on the Thames is in the background. (Photo by Fox Photos/Getty Images)





Early morning rush hour traffic crossing London Bridge , Central London, 12th January 1933. (Photo by Douglas Miller/Topical Press Agency/Getty Images)





Children pour out of their School in Drew Street, Silvertown, in the east end of London, with the liner Rajputana in the background, 15th January 1932. (Photo by Popperfoto/Getty Images)





American silent film actress Phyllis Gordon (1889 – 1964) window-shopping in Earls Court, London on August 9, 1939 with her four-year-old cheetah who was flown to Britain from Kenya. (Photo by B C Parade/Getty Images)





A cleaner dusts a cast of a dinosaur skeleton at the Natural History Museum in London, 12th November 1936. The cast was made from the D. Carnegiei diplodocus at the Carnegie Museum of Natural History, Pittsburgh, and was presented to the London museum in 1905. (Photo by William Vanderson/Fox Photos/Hulton Archive/Getty Images)





Emergency buses leaving Victoria station, London, following an underground train crash on the District Line, 17th May 1938. (Photo by H. F. Davis/Topical Press Agency/Getty Images)





Tuberculosis patients from St. Thomas' Hospital rest in their beds in the open air by the River Thames, opposite the Houses of Parliament. May 1936. (Photo by Fox Photos/Getty Images)





Two holidaymakers amuse themselves with a porter's trolley whilst waiting for their train at Euston Station, London, 5th August 1939. (Photo by A. J. O'Brien/Fox Photos/Getty Images)





Three women pictured going for a swim in the Serpentine, Hyde Park, London, complete with their gas masks, 1930-1939. (Photo by Keystone/Getty Images)





Victor Berlemont, a French publican working in an establishment of London's Soho, circa 1939. (Photo by General Photographic Agency/Getty Images)





Two divers jumping off the Embankment into the River Thames in London, near Westminster Bridge on May 13, 1934. (Photo by H. F. Davis/Getty Images)





Nannies push prams in Hyde Park, London alongside Rotten Row, 1936. (Photo by General Photographic Agency/Getty Images)





Queen Victoria jubilee clock removed for traffic improvement in London on August 1938. (Photo by Keystone-France/Gamma-Keystone via Getty Images)





School children play in Hyde Park, London, UK about 1935. (Photo by Austrian Archives/Imagno/Getty Images)





A photograph of a little girl drinking from a fountain with a lion's head at Finchley Swimming Pool, London, taken by Tomlin for the Daily Herald newspaper on 6 August, 1937. (Photo by Daily Herald Archive/SSPL/Getty Images)





A crowd of people wearing swimwear bathing in the Serpentine during the high temperatures in London's Hyde Park, 27th August, 1930. (Photo by Popperfoto/Getty Images)





A water cart man turns the water main on a group of boys to help them cool off in a street in Westminster, London on August 1930 during a heatwave. (Photo by Fox Photos/Getty Images)





Four swimmers enjoy an ice-cream at the water's edge in Roehampton swimming pool, UK, 23rd May 1936. (Photo by Reg Speller/Fox Photos/Getty Images)





Swimming pool on the roof of Piccadilly London hotel, 4th August 1932. (Photo by Austrian Archives/Imagno/Getty Images)





Two young men out for a walk wearing shorts because of a heatwave in London, 1932. (Photo by Getty Images)