I discovered a leak which I think was coming from the bottom of the
cistern where the exit pipe runs to the bowl.
The cistern is enclosed in a nice cupboard :-(((
We had clean water seeping between the bowl and the floor. I think a
very slow leak has been running from the exit pipe and then ending up
behind the bowl and the exiting on the floor

With much swearing I got a hand in and tightened the joint as much
as a could (perhaps 1/16 of a turn.)
the leak is now much more and seems to occur when the toilet is
flushed - as witnessed by water coming through a joint in the
'skirting board' bit of the cupboard. - ie a different place.

there isnt enough space to get a mirror/torch round the cistern to
have look and see what s going on . there is just enough space for a
forearm.

IS there a likely source of the leak before I (or perhaps someone who
knows a bit more about it ) removes the bowl, takes the cupboard apart
and has a look ?