Scenes of chaos at local lidos are being reported across the country as people desperately try and escape the searing sunshine.
Scuffles and arguments have broken out at many of the public outdoor swimming pools as Britain basks in what could be the country's
With forecasters predicting a possible high of 39C, hundreds are descending on lidos to cool off sparking out of control three-hour long queues full of families and children.
Police have been called to several incidents to try and calm situations, including at London's Parliament Hill Lido and Brockwell Lido, while Tooting Bec Lido is operating a "1 in 1 out system".
Security and police were called to Parliament Hill Lido, in Hampstead Heath, following reports of ‘minor scuffles’ as swimmers lined up to enter at around 10am.
Have you experienced any issues at a lido today? Email webnews@trinitymirror.com
The City of London Corporation, which manages the Lido, shut the queue at about 10.20am because it was already so busy.
Posting on Twitter , they said: “Please be aware that we are now closing the queue for Parliament Hill Lido for the rest of the day as we’re already exceptionally busy with the expected hot weather .
“Please do not arrive at the Lido now as the queue is closed and we will not be able to admit any more swimmers for the rest of the day. Sorry for any disappointment, and thank you for your understanding.”
Police were also reportedly called to Brockwell Lido after "security lost any control of crowds" with queues of up to three hours.
One person wrote on Twitter: "Security lost any control of crowds outside Brockwell lido now. Police called to try and move teenagers who have crashed the queue."
Another said: "I thought 7am would be early enough to beat the queue at Brockwell Lido...I was wrong!"
While a third fumed: "Got to queue at 8.40 am - an hour later different gangs of teens kept queue barging. Told security and they said they wouldn’t let them in but it kept on happening.
"Got to front, another sweat bath of teens, couldn’t get in and they shut doors. Abandoned queue. ATROCIOUS.
"The most badly managed system I’ve ever experienced in my whole life - gangs of teens queue barging meant despite queuing 3 hours (this included pregnant women and small children ), still didn’t get to swim even though I turned up at 8.40am. Why was nothing done to stop them...?"
Another also criticised the "lack of foresight and planning".
They added: "Very cross could not get into the lido for my pilates class. Lack of foresight and planning meant police were called Brockwell Lido. Security also gave me wrong information let others in and not me."
Meanwhile Tooting Bec Lido also confirmed it had reached full capacity this morning and is operating a "1 in 1 out system".
They tweeted earlier: "Queue Update- Please note the queuing period at the moment is around 2 hours. Please factor into your visit that we are likely to reach full capacity before midday."
Photos show streams of people overflowing from a nearby park as they try to get to the lido in Herne Hill, South London.
One person claimed they were "getting abused" by a group who were jumping the queue.
He admitted defeat and left.
He said: "Enough for me, I’m done. I’ll try Brockwell Lido tomorrow, far more pleasant experience there."
Queues started forming around the country as early as 6am.
In Yorkshire, Helmsley Lido tweeted it was full this afternoon.
They added: "The hottest July day and we’re FULL! We hate to disappoint, but it’s days like this that keep us going.
"Thanks for your ongoing support and please be kind to our lifeguards who have to stay alert and focused in the blistering heat."
Portishead Lido, near Bristol, is also warning of a "VERY long queue" and that it is at capacity.
They are urging people to "be prepared for a long wait."
"And there's no shade," they added. "Bring water, snacks, folding chair, sunscreen, a hat and some patience & humour."
There are also reports of The Friends of Peterborough Lido having "huge" queues.
London Fields Lido in Hackney, London, is also at capacity.
While Pools on the Park in Richmond, Surrey, is not letting anymore people in until 6pm.
But those who have managed to get into a lido today have been pictured having fun and splashing about in the water as they cool off, including at Northcroft Leisure Centre lido in Newbury, Berkshire.
Tinside Lido in Plymouth is also proving popular as youngsters take to the water with their inflatables.
