Video report by ITV News Correspondent Duncan Golestani
Britons have made the most of a mini heatwave as forecasters confirmed that Tuesday was the hottest day of the years so far.
Highs of over 33C were recorded in Brize Norton, Oxfordshire, with the mercury expected to climb yet higher to 35C in some parts of the South East.
Scores of people shed their clothes to bask in the sunshine, as temperatures soared around the country.
The hot weather, caused by a warm plume of air that has worked its way northwards from Spain, has prompted health warnings.
Health chiefs said they had seen a spike in emergency calls, with London alone recording 300 more contacts than usual.
Public Health England (PHE) is urging people to look out for elderly relatives and friends who may be susceptible to the high temperatures - and to take extra care of young children, babies and those with heath issues.
Meanwhile the Met Office has issued weather warnings for heavy rain across much of the UK for Tuesday and Wednesday as the muggy weather breaks into thunderstorms in many areas.
However, many holidaymakers were content to make the most of the sunshine and searing temperatures while they last.
Despite the warning, members of the public headed outdoors en masse to soak in the rays around the country.
Even Number 10 Downing Street's resident cat Larry was spotted getting in on the action while sprawled outside the prime minister's official residence.
Larry the cat was not the only animal species basking in the sun on Tuesday.
Barbary macaques at Blair Drummond Safari Park in Scotland were spotted trying to keep cool in the heat.
In the Scottish Highlands, polar bears were pictured frolicking around with traffic cones.
People with hay fever will suffer with pollen levels high over the next few days.
Temperatures could be as high as 22C overnight on Tuesday.
The hot and humid air is expected to trigger thunderstorms across much of the UK from Tuesday evening until late on Wednesday, with a severe weather warning for rain and the possibility of flash-flooding.