"I wanted to keep you updated on progress on repair to this main. Work overnight has identified that this is a much more complex burst than we were aware off and has revealed that the burst is on a larger 27 inch main. The problem has been compounded overnight by the necessity to adjust valves to maintain supply to customers, prior to turning off this larger main. Our teams have worked throughout the night, and repair work will resume again at midnight tonight to carry out the repair. Again this is to minimise the impact on customers throughout."
From Scottish Water