A woman was airlifted from the festival with spinal injuries this afternoon.
Dorset and Somerset Air Ambulance said the woman was taken to Southmead Hospital in Bristol.
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Police officers should not physically restrain people with known or suspected mental health problems, the official watchdog has said.
A blustery start to the day will be followed by rain as the morning progresses.
A wet and windy start for many areas, with some heavy rain at times.