wow, thanks for all the responses.
The shower is actually above the bath and there's no leaking when I take a bath so it's defintely not the waste water that's to blame.
I'd like to check out the shower itself but because it's built into the wall, I don't know how to get at it. There's no...
I'm hoping someone can help me. Having found a puddle on the kitchen floor I traced it back to the shower upstairs.
It only occurs when the shower is in use which leads me to believe it's the shower mixer itself that is leaking. Unfortunately I can't get to it to have a look and/or fix it...