The fact is the drips can come from the water supply pipework if the leak is from the other side of the valve used to turn the water supply on, but a closer examination will identify the location of the leak if it is coming from the water on/off valve, for example, the bath/shower valves are usually located in a different location to the drains in the shower/bath, so look closely to check where the leak is coming from. the exploring work is usually done by a plumber, he should be able to open the ceiling and then fix the leak, you then will need a plasterer/builder to make good the damaged caused to the ceiling, care should be taken at each stage to minimise the repair works and give consideration to the next trades person to follow, this will keep cost down for the customer to a minimum.
Hi, a gas safety inspection (gsi) can vary for a number of reasons, you location/traveling time, the access to the boiler and to the gas meter to do what is called a drop test. prices range from £75 -£150 inc of vat