I have worcester 24 cdi boiler bout 9 years old. ive noticed a drop in water pressure from the hot and cold taps in the last few days prob bout half the pressure i had before. then couple days ago i came down one morn cause i thought i could here a tap running when i got to kitchen i could hear water running through the boiler andd could also hear it running through certain radiators yet the boiler wasnt even switched on . i turned mains water off but this is still constantly happening it doesnt stop, im still getting hot water from tap and when put ch on it works ok, can anyone help me with problem please the noise is driving me mad lol. thanks phil