ANGRY residents have called for action from Wiltshire Police and Wiltshire Council after a swan was covered in a black substance which had contaminated a local pond. They say the pond off Mane Way has been turned from a mini-nature reserve into a local drugs den and is littered with rubbish left behind by youths and adults who frequent the area. Owen Singer, from nearby Penleigh Farm at Dilton Marsh, said: “I am horrified that oil has contaminated the balancing pond and wild life at the end of our track. “Sadly I am not surprised, we suffer from an incredible amount of fly tipping and littering from I hope a minority of despicable ignorant people.