LONDON, ENGLAND - AUGUST 30: Two hot air balloons fly over Tower Bridge on the River Thames as dawn breaks and the sun rises over the British capital city on August 30, 2016 in London, England. The south east of England has recently seen consistent hot and dry weather with temperatures often exceeding 30 degrees Celsius. The dry weather with good visibility and low wind speeds makes it ideal for hot air balloon flights. (Photo by Chris J Ratcliffe/Getty Images)