Richard Du Parcq Amy repeatedly hit his 18 and 19-year-old victims with the weapon after becoming worried they had contaminated the water containing the koi, worth between £35,000 to 40,000.

The Magistrate's Court on Friday heard that Amy had launched the attack after the 56-year-old's daughter had invited several friends to the family's St Lawrence house on the night of 8 April.

Amy, who was sentenced to 100 hours' community service after admitting the assaults, went to sleep at around 9.30 pm but woke up less than two hours later when he heard loud shouting and swearing from outside, the court was told and after coming downstairs and complaining to his wife, he saw the teenagers by the pond and believed they were going to urinate into it, the court heard.

Armed with the piping, the defendant confronted the pair and shouted that they were to leave the premises and he then started swinging the weapon at them – hitting the first victim on the wrist, forearm and buttocks.

As the teenager ran away, Amy swung at his second victim, the court heard, hitting him three times on the back and both boys were treated at the General Hospital, with one suffering swelling to his wrist and the other an injury to his back.

The teenagers later admitted to having urinated in the pond, the court was told.

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