Some possibly overlooked quotes from the article:
"But a security guard told them to stop – despite the crew being allowed by law to land anywhere and damage property to get to a patient."
‘The paramedic told him that they had to get to someone who was badly injured. ‘But the guard just replied, “You’ll have to take off again then.”
His head of security confirmed the helicopter had landed, saying: ‘It just plonked down outside the house, landing on private ground without permission, and that was the issue.
‘We don’t have a problem with the air ambulance landing here or cutting the fence. They’ve done it before, but we do need to be notified first."
Clearly way too much ego & lack of common sense by a security guard with no real legal authority beyond that of a private citizen.