During the last year or so, I've had a bit of trouble with both the loos
in our house. In both cases the ball valve in the cistern broke, leading
the cistern to fill continuously. Lots of water flowed out through the
overflow pipes, which in both cases lead outside the house. But lots of
water also overflowed over the top of the cistern, in one case causing
quite a bit of damage.

Anyone got any ideas why the overflow pipes weren't up to the job, and
what I can do about this?
--
Simon Elliott
http://www.ctsn.co.uk/