A closer look today shows the pipework is really rotten so needs to be replaced. I assume there's no issue replacing the cast iron with plastic which I assume would be the easier/cheaper option.
Slightly complicated by the fact that this soil pipe does connect to the soil pipe from the ensuite in the loft at the top but hopefully that shouldn't be much of an issue.
A closer look today shows the pipework is really rotten so needs to be replaced. I assume there's no issue replacing the cast iron with plastic which I assume would be the easier/cheaper option.
Slightly complicated by the fact that this soil pipe does connect to the soil pipe from the ensuite in the loft at the top but hopefully that shouldn't be much of an issue.