Need recommendations for drain specialist - not plumber

[PeckhamPenny]

Hi everyone, a kind plumber said what we needed for our complicated bathroom drain situation was a drain specialist. However, he didn't have any suggestions. Has anyone a recommendation based on positive experience?

Thanks so much!

[PeckhamPenny]

Hi again, we managed to fix it with a blower and bendy piping. However, we'd still like to collect some proper specialists for the books when a homemade approach won't do!

[Calsug]

Would recommend Dave from down the drain. Did a great job fixing our soil pipe outside

He is able to carry out CCTV surveying if required as well.