I have recently had fitted a Bristan Quebec monobloc mixer kitchen tap, the taps themselves are fine but the problem is when they are turned off. About 30 secs after they are turned off then a large amount of water runs from the tap, almost as if all of the water that is left in the mixer part of the tap is released. Now whilst this isn't really a problem, it is extremely annoying Can anyone tell me what is causing this or more importantly, how do I stop it