BigWallop wrote:

Are you sure that the soil stack is only 90 mm (3.5'') in diameter Steve, as
anything less than 110 mm (4'') is not allowed for solid waste soil pipes. Have
you changed the use of the room into a bathroom ? Or was the room changed
around before you moved in to the house ?

The soil stack has 3 1/2" stamped on it. As far as I know, it's always
been the bathroom. The stack is abut 50 years old.

Does the original WC connect to the pipe with a normal pan connector or is it a
bodge of different sizes of pipe ?


It looks like a normal pan connector.

--
Steve Loft