Japanese Knotweed Expert Services. INNSA MEMBERS. A multi-disciplinary consultancy, offering services for domestic and commercial clients in the planning, development and construction industries. Specialising in the following surveys, assessments and reporting: JAPANESE KNOTWEED ERADICATION and management INNSA Insurance Backed Guarantee, CONTAMINATED LAND, ECOLOGY, AIR QUALITY, NOISE and VIBRATION and FLOOD RISK. We aim to assist our clients throughout the planning process liaising with other consultants and local authorities, in order to ensure a positive outcome with the least fuss possible. If you are looking for a provider of personal, professional and efficient environmental consulting services, then please give us a call, or email us for a fast response to your enquiry.