Neighbour has built an extension and replaced his roof guttering (see below). It leaks at the join, which is a few inches on our side from the party wall. The new guttering (on the right) is a different design/size. And the downpipe should be further in to his side, based on the approved plans.
How can this best be fixed so that the guttering does not leak when it rains? The water falls on to our patio.
How can this best be fixed so that the guttering does not leak when it rains? The water falls on to our patio.