Everyone, please be WARNED. Do not use Diamond Drainage! In late September 2022 Reece and Liam from Diamond Drainage came to unblock a slow-moving bath. They managed to get their machine, which they had put down the bath sink pipes, stuck into the pipes down below, above the basement flat, and flooded it down there. We had to hire someone else to cut a hole into the basement kitchen ceiling to get their machine unstuck and we had to employ an electrician to make the basement electrics safe. The ceiling and walls were soiled. Water was coming through the ceiling lights.
As of January 11th 2023, they have still NOT paid the money to the tradespeople who attended to remedy their blunders. They refused to allow us to get someone in to make good the hole and the redecoration saying they would do it. They have made excuse after excuse and as of this date they have still not done it. I have since found out that they could not even have done the job in the time they were intending to allocate to do it. Plasterboard (for the repair to the hole) requires days (even weeks) to dry before painting over it. They were intending to do it all in a day. They were clearly planning to do another sub-standard job, one that they are not qualified to do.
I have given them well over 3 months to remedy all this and still they stall.
The blocked sink was resolved, by some other contractor, by pouring liquid one-shot down the plug hole. So simple.
Do use them. You do so at your peril!