Leaky Soil Stack - Who could repair/replace?

[ExpectingToFly]

Hi. So I've got a problem with my poo pipe
It's half cast iron and half plastic (such am awful bodge job by previous owner)
It's leaking from a join . I just don't know who to ask to come and look. A plumber or builder or drainage company?
Would appreciate any advice pls need to get it sorted asap 💩

Mine was in a similar and replaced by a drainage company (as part of other drain works)

Small local builder who has been in business fir some years and has a local address and landline number.

You need a personal recommendation.

A listing on a website that they pay for, and where unfavourable reviews can be censored out, is NOT a personal recommendation. It is an advert.

Good builders and tradesmen are busy and don't need to pay for adverts on websites.

Our plumber did ours.