You can buy cast iron rainwater goods at Jewsons.

I've been following this thread with interest,
as I have been vaguely thinking of installing a long downpipe -
around 50ft - and would probably be required to use cast-iron
as the property is a listed building,
and the downpipe would be in the front of the building.

I'm wondering if this would be a feasible project?

The reason I am considering this is that at present
the rain water from a very large roof goes over a valley
in the roof of our part of the property - an old orphanage -
and it is slightly disturbing to have what sounds like
quite a large river going over our heads.

--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin 2, Ireland