In North Wales, engineer Luke and his team of plumbers are midway through a project to replace a problematic 2km section of pipe that has a history of large bursts.

Engineers race against time to find and fix a massive leak on the busy A6 road in Stockport, which has left thousands of customers with little or no water. Steve and Oz unblock an overflowing drain in a customer's garden, while Luke and his dogs try to sniff out a leak in a field in Cumbria.