The gentleman was prompt and very pleasant and he didn't make a mess in my kitchen. He identified that the problem wasn't a blockage between the sink and the drain outside. An outside drain is blocked and although he tried very hard to clear with rods, so the water did drop by about 30cm in the manhole, it seems the pipe itself has an issue (previously my main front sewer pipe crumbled & has been replaced). I am having to get my insurer to sort out the problem and replace the drain. I am happy with the work that Colin did and of the effort he spent in trying to help me. I would hire him again.