Certified Japanese Knotweed and Bamboo Removal and Treatment Services. Qualified Japanese Knotweed surveyor, our knotweed services come with a 10-year insurance backed guarantee. We cover the whole of South Wales (including Swansea, Cardiff and Newport), the West Wales area up to North Ceredigion and Powys, and throughout South Glamorgan & Gwent. We also carry out contracts in Bristol and deep into the West Country, as far north as Shropshire, and into the Midlands & Birmingham areas.