About Us

With over 25 years’ experience in our field, TCM continue to be a market leader in Japanese Knotweed eradication throughout the UK and the Republic of Ireland.

As environmental consultants, Total Conservation Management Ltd (TCM) are specialists in the control and eradication of Japanese Knotweed and other invasive weeds, as prescribed by UK and EU legislation.

Scientifically proven strategies

We remain at the forefront of the industry with scientifically proven strategies that are supported by a Lloyds A+ Insurance Backed Guarantee (IBG), which satisfies UK Mortgage Lenders.

Compliance with health, safety and environmental standards

We comply with national health, safety, and environmental standards ensuring each project is carried out safely, and we endeavour to perform our services with minimal environmental impact.

Market leaders in Knotweed eradication

With over 25 years’ experience, TCM continue to be a market leader in Japanese Knotweed eradication throughout the UK and the Republic of Ireland.  We have office locations in London, Suffolk, Hertfordshire, Merseyside, and Cardiff. 

Our clients and projects include:

Since inception, Howard Downer and TCM have successfully completed projects for, amongst others: the Commonwealth Games site in Scotland, Network Rail, Barratt Homes, Watkin Jones, Lovell Developments, Fairview Homes , Taylor Wimpey, CBRE, Persimmon Homes, Abbey Developments, Keepmoat Homes, Hopkins Homes, Gleeson Homes, Redrow Homes and various housing associations across the country.


The life cycle and growth patterns of Japanese Knotweed start to be recognised, resulting in increased interest in this invasive weed across the country


TCM partnered with Writtle College to develop a KTP (Knowledge Transfer Partnership)


TCM complete a Soil Screen project at Wembley Stadium to eradicate a long standing Japanese Knotweed infestation


TCM were commissioned by the Olympic Delivery Authority to carry out works at the 2012 Olympic games site in East London


TCM complete the most significant project in the UK at that time by removing Japanese Knotweed from a brownfield site in Camborne, Dorset – over 160,000 of soil was screened, with the majority being able to be reused on site


TCM partner with Bath University to research evolving Japanese Knotweed eradication methods


TCM eradicate Japanese Knotweed via herbicidal methods at the Eden Project, Cornwall


TCM were commissioned to remove Japanese Knotweed and Giant Hogweed from the Commonwealth Games site in Glasgow


TCM complete a Dig and Dump removal of Japanese Knotweed project on the Scottish Borders railway


TCM were commissioned to use Dig and Dump Japanese Knotweed removal system for the London Overground at West Hampstead station, North London


Bouygues/University College Hospital, London commissioned TCM to eradicate Japanese Knotweed at the site of their new Cancer and surgery wing


TCM were commissioned by Taylor Wimpey to clear Japanese Knotweed and Himalayan Balsam at a new housing development in Wales

Howard Downer


Howard Downer, AKA Dr. Knotweed, has over 20 years of experience as an Environmental Consultant and is regarded by his peers as one of the most knowledgeable people in the Japanese knotweed industry.

Follow Dr. Knotweed to hear about the latest developments regarding Japanese knotweed and the implications of infestation.

Latest Residential Case Studies

Latest Commercial Case Studies

Need Some Guidance?