The Health and Safety Executive is now leading the investigation after a Royal Estate worker at Sandringham had to be rescued from a lake .
The gardener who is in his 30's was on a ride-on lawn mower when he fell into the water. He remains in a critical condition at Addenbrookes Hospital. Norfolk Police say they are no longer leading the investigation into the incident.
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After what's been the hottest day in the region for almost 10 years there are warnings tonight about the dangers of swimming in open water.
Today was the hottest day of the year so far but temperatures will be down a little tomorrow with the risk of thunder.
A sizzling day for the Anglia region with temperatures rocketing into the mid 30's.