Many homes in the UK have Cast Iron Soil Stacks their longevity is usually a maximum of 100 Years. After which they begin to corrode and need replacement. The modern way of replacing a Cast Iron Soil Stacks is to replace it with a modern PVC Soil Stack, they are much easier to maintain, and repair.
Underground drains are a nuisance, they are not so easy to access and can cause all sorts of problems. A CCTV report will allow us to inspect the drains and find exactly where the problem is.