Our outside pipe burst in cold weather. We were away, a neighbour called a plumber who turned the water off. It has now been repaired/replaced. There is no leak BUT only a trickle of water now comes from the tap. We need this outside tap for watering garden, we are elderly. We hear a hissing sound when we turn the tap on along with the dribble. We have tried running it for ages, running all taps etc. The tap and water supply comes from the cold water in the kitchen and is situated directly through the same wall to the outside. Any suggestions, before we call a plumber again.