People try to stay cool while out and about as temperatures reach at least 36C in London, where many of the usually lush green parks have turned brown after weeks of high temperatures. The UK meteorological agency the Met Office said temperatures could get even hotter on Tuesday, breaching the 40C mark for the first time. The Met Office last week issued its first ever red extreme heat warning for large swathes of England, coming into effect today. IMAGES AND SOUNDBITES