I spent ages on the phone trying to report this leak some weeks ago. It has been leaking for over a year. I only see it when walking the dog and so often forget to report it. A S.W van did come out to inspect it (I saw them) and nothing has happened since!  That was a few months ago. Although not gushing, on the driest summer day there is always a wet puddle/patch on the floor with green mildew around the edges, indicating that there is always water present.  Sometimes the puddle is quite bad, it is NEVER dry.  I can see this isn't urgent but I have read that with water leaks, the amount of water you can see above the ground is doubled underground. Either way, it is still a precious resource filtering away!