Police were called to deal with numerous scuffles at Parliament Hill Lido this morning, as tempers flared over queuing.
Officers were first at the scene at 9.49am after a "number of minor scuffles" broke out as swimmers queued to enter the open air pool.
It's believed people had tried to jump the queue. The City of London Corporation stopped people queuing to get into the Lido at 10.20am because of high demand.
It's the third day in a row that it has stopped people lining up to enter the lido. The late swim has also been cancelled.
Cops are still at the lido on Hampstead Heath to prevent further disorder.
There has been no arrests or reports of any injuries.
Temperatures in London are expected to reach 37c today, just short of the city's record of 38.1c. The hottest temperature ever recorded in the UK is only fractionally higher, at 38.5c.
The City of London Corporation has been contacted for comment.
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