Hi
For the past few months I have heard a dripping noise coming from the waste pipe in my bathroom, I have checked all my faucets and there are no leaks anywhere, the noise is becoming increasingly worse especially at night and is staeted waking me up. There is definitely water coming from somewhere as you can feel it reverberating the pipe. Also I live in a flat could it possibly be getting caused by someone else ?

If you have a hidden leak moisture will show up somewhere. Could the noise be a tapping noise? Do you hear it more when you run water or drain something?
Have you shut everything down and gone out to the meter and checked the little pointer for creep? Let me know, Tom

Could be a leaking flapper valve in the toilet. The water builds up to the spill level and drips over. It could also be from someone above you. Put some red food coloring in the tank and see if it gets into the bowl.