We have an external soil pipe which goes through the polycarbonate roof
of a conservatory and is boxed in below that down to ground level.

The soil pipe has cracked and a chunk broken away above the level of the
polycarbonate roof. The soil pipe is made from some kind of asbestos.

When the upstairs bog is flushed, a trickle of water runs down the roof
and into the guttering.

None of this seemed to be causing a major problem however I now think
this water is also coming down the outside of the soil pipe and down
inside the boxed in section.

Will an insurer cover fixing something like this? It does not seem to be
storm damage just the general age and wear on the pipe (50 years old).

If the work is to be done I would like to combine the soil pipe with a
second bath waste pipe which runs to a separate drain, to enable the
drains to be combined and the bath waste drain to be got rid of. Would
the insurers be willing to pay for just "their" bit but allow this extra
work to be done as part of the same job?