Qualifications & Accreditations

We have a variety of different qualifications and accreditations, giving you peace of mind and making us a reputable and qualified company to deal with your invasive weed problem.


Property Care Association

The Property Care Association promote high standards of professionalism and expertise within the industry. There are strict guidelines to be a member of the PCA. The Property Care Association have an Invasive Weed Control section and this includes leading industry experts who adhere to the strict criteria for PCA membership. The PCA dedicate a vast amount of time to researching Invasive Weeds.

The Managing Director of the company, Mr Jason Harker, is a Certificated Surveyor in Japanese Knotweed (CSJK) and Japanese Knotweed Expert is a member of the PCA.

Download a copy of Mr Harker’s certificate or a copy of our membership certificate.


ISO 9001-Quality Management System - Qualifications and Accreditation



ISO9001 is one of the world’s most recognised standards for ‘quality’ in terms of the product and service a company delivers. This means that we consistently deliver an excellent service to our customers. We commit to reducing errors whilst increasing levels of customer satisfaction.



ISO 14001-Environmental Management System - Accreditation



ISO14001 specifies a set of environmental management requirements for a company to comply with. The purpose of this is to encourage companies to protect the environment, to prevent pollution and improve their environmental performance. We are dedicated to protecting the environment and ensuring that we dispose of waste correctly and our chemicals are stored safely.



BS OHSAS 18001-Health & Safety Management System - Accreditation


BS OHSAS 18001

BS OHSAS 18001 is an occupational health and safety management system specification. This shows that we are providing a safe working environment to protect our employees and to also improve their performance. This means all of our employees are supplied with the correct PPE gear to ensure they have the correct protection and equipment for the work that they are carrying out.




City and Guilds - Qualifications for Japanese Knotweed Expert

City and Guilds

All of our on-site staff have PA1, PA6 and PA6AW qualifications. PA1 gives our employees the basic knowledge of legislation for pesticides. PA6 is needed for anyone wishing to apply pesticides using a handheld lance or knapsack sprayer.  PA6AW is needed for anyone wishing to spray in or near water. This means that all of our staff have the correct knowledge and skills to use any chemicals required to treat invasive weeds.




Trustmark is the only Government endorsed scheme for trades in and around the home. They award registered firms with our accreditation after thorough vetting and on-site inspections to ensure the firm is raising industry standards. This accreditation gives customers reassurance of quality and protection from rogue traders.



Safety Schemes in ProcurementSafety Schemes in Procurement

Safety Schemes in Procurement actively works to promote high standards of Health and Safety within the UK. They set strict guidelines on Health and Safety competence and assessing contractors in accordance with these.



Constructionline - Accreditations and QualificationsConstructionline

Constructionline is a provider of procurement and supply chain management which defines strict guidelines for contractors who wish to be accredited, including Health and Safety, Equality and Diversity and Quality Management.  Japanese Knotweed Expert are a Gold accredited member of Constructionline.



Supply Chain Sustainability School Logo

The Supply Chain Sustainability School

The Supply Chain Sustainability School is an award-winning collaboration, with the aim of creating “A world-class collaboration to enable a sustainable built environment”. All members are provided with training in three different areas (Sustainability, Management and Offsite) and have access to a number of networking events based on creating a sustainable business.




CPD Member – The CPD Certification Service

The CPD (Continuing Professional Development) Certification Service is a “leading independent CPD accreditation institution”. Training courses are rigorously inspected and tested to ensure the highest quality of training is delivered.  As a result of our many years of experience, Japanese Knotweed Expert Ltd is proud to be a certified expert trainer, delivering courses in Japanese Knotweed identification and similar topics. You can view our membership certificate here.