During and after I have a shower I can hear a dripping inside a boxed-in area in an adjoining room where the drainage pipes are fed out of the bathroom and downstairs.
I think I am going to have to break the boxing-in to get access to see (and fix) a leak if there is one, but I'm wondering if there is a way to fix a small leak from the inside of the pipe to minimize destruction; for example, pouring something down the pipe that would seep into any leaky joints and seal them?
Edit: 1) Someone has changed the question title to a question I wasn't asking. It wasn't my intention to ask "how to fix a small plumbing leak from inside the pipe".
2) Today I experimented a bit. I ran the shower cold for a bit, and listened out. No dripping. I then ran it hot and used it, and the dripping was present. I think it might be water supply pipes expanding/contracting as a result of usage. (I hope so anyway)
I have not decided yet but I may buy one of those probe camera things and make a small hole to have a look through.