View our members

Here you’ll find a full list of INNSA members. You can find a more detailed company profile which includes accreditations, qualifications held, which locations covered and all species dealt with, when you click read more under each profile.


Invasive Weeds Agency

Accredited Contractor and Consultant Member

Invasive Weeds Agency Limited (IWA) is an Edinburgh based company specialising in invasive weed management and ecology. Founded in 2007, by father and son, Nigel and Graham Rudd, IWA has successfully eradicated Japanese knotweed, Giant hogweed, and Himalayan balsam on many sites across the UK. As one of the UK’s longest practising ecologists, Nigel Rudd’s experience has led IWA to great success and driven the company to pursue projects with real ecological benefits such as Japanese knotweed and Rhododendron control for charities in environmentally sensitive areas.

Driven by our desire to offer our clients the best service possible, IWA conforms to the highest standards set by BASIS (the independent authority for the pesticide industry), we are qualified members of the BASIS Advanced Contractors Certification Scheme (BACCS) and we meet the Amenity Assured standard. Our BASIS qualified advisor and trainer, Graham Rudd, ensures IWA maintain these high standards while offering the opportunity to educate individuals and companies on invasive weed management as a commitment to Continuing Professional Development (CPD).

Company: Invasive Weeds Agency

Company Type: Accredited INNSA Contractor and Consultant Member

Accredited: Yes

Address: 54 Hope Street, Inverkeithing, KY11 1LN, UK

Contact: Graham Rudd

Tel: 01383 416 556

Position: Business Manager

Locations: All Regions

Clients- Private Individuals: Yes

Clients- Business:Yes

Waste Carriers License: Yes

Amenity Assured Standard: Yes

Professional Indemnity Insurance:Yes

Employers Liability Insurance: Yes

Public Liability Insurance: Yes

Number of Staff: 2


Email: [email protected]


First Aid: Yes

H&S: Yes


PA1: Yes

PA6AW: Yes

Chainsaw: Yes

Brushcutter: Yes

Aerial Rescue: Yes

IEEM Accredited: Yes

IEMA Accredited: Yes

Japanese Knotweed (Fallopia japonica)

Himalayan Balsam (Impatiens glandulifera)

Giant Hogweed (Heracleum mantegazzianum)

African Clawed-toad (Xenopus laevis)

Alpine Newt (Mesotriton alpestris)

American Mink (Mustela vison)

American Skunk-cabbage (Lysichiton americanus)

Asian Hornet (Vespa velutina)

Australian Flatworm (Australoplana sanguinea)

Bar-headed Goose (Anser indicus)

Black Swan (Cygnus atratus)

Broad leaved dock (Rumex obtusifolius)

Bull Frog (Lithobates catesbeianus)

Canada Goose (Branta canadensis)

Canadian Goldenrod (Solidago canadensis)

Canadian Waterweed (Elodea canadensis)

Carolina Watershield (Cabomba caroliniana)

Carpet Sea Squirt (Didemnum vexillum)

Chinese Mitten Crab (Eriocheir sinensis)

Chinese Water Deer (Hydropotes inermis)

Coatimundi (Nasua nasua)

Cotoneaster (Cotoneaster species)

Creeping thistle (Cirsium arvense)

Curled dock (Rumex crispus)

Curly Waterweed (Lagarosiphon major)

Edible Dormouse (Glis glis)

Egyptian Goose (Alopochen aegyptiacus)

Emperor Goose (Chen canagicus)

Eurasian Eagle Owl (Bubo bubo)

Evergreen Oak (Quercus ilex)

False Acacia (Robinia pseudoacacia)

Floating Pennywort (Hydrocotyle ranunculoides)

Garlics (Allium species)

Giant Rhubarbs (Gunnera species)

Giant Salvinia (Salvinia molesta)

Horsetail (Equisetum species)

Hottentot Fig (Carpobrotus edulis)

Indian House Crow (Corvus splendens)

Japanese Rose (Rosa rugosa)

Killer Shrimp (Dikerogammarus villosus)

Kontikia Flatworms (Kontikia ventrolineata and andersoni)

Leathery Sea Squirt (Styela clava)

Marestail (Hippuris vulagaris)

Marsh Frog (Pelophylax ridibundus)

Midwife Toad (Alytes obstetricans)

Monk Parakeet (Myiopsitta monachus)

Montbretia (Crocosmia x crocosmiifolia)

Muntjac Deer (Muntiacus reevesi)

New Zealand Flatworm (Arthurdendyus triangulates)

New Zealand Pigmyweed (Crassula helmsii)

Nuttall’s Waterweed (Elodea nuttallii)

Orange Sheath Tunicate (Botrylloides violaceus)

Parrot’s Feather (Myriophyllum Aquaticum)

Ragwort (Senecio jacobaea)

Red-eared Terrapin (Trachemys scripta elegans)

Rhododendron (Rhododendron ponticum)

Rose-ringed Parakeet (Psittacula krameri)

Ruddy Duck (Oxyura jamaicensis)

Russian-vine (Fallopia baldschuanica)

Sacred Ibis (Threskiornis aethiopicus)

Siberian Chipmunk (Tamias sibiricus)

Signal Crayfish (Pacifastacus leniusculus)

Sika Deer (Cervus nippon)

Slipper Limpet (Crepidula fornicata)

Spear thistle (Cirsium vulgare)

Turkey Oak (Quercus cerris)

Wakame (Undaria pinnatifida)

Water Fern (Azolla filiculoides)

Water Lettuce (Pistia stratiotes)

Water Primrose (Ludwigia peploides)

Western Green Lizard (Lacerta bilineata)

Wireweed (Sargassum muticum)

Wood Duck (Aix sponsa)

Zebra Mussel (Dreissena polymorpha)

Case Studies

River Douglas, Wigan

River Douglas, Wigan Treatment of large amounts of Japanese...
Read More

Narvick Way, North Tyneside

Narvick Way, North Tyneside Excavation from construction area, with...
Read More

Lanark Way, Belfast

Lanark Way, Belfast Site survey and treatment plan for...
Read More

Latest News

What are the biggest problems facing INNSA members?

In the coming week, we will be sending out an...
Read More

Invasive Aliens – What’s it all about?

So, contractors, how do you explain “Invasive Alien Species” to...
Read More

What’s it all about?

Invasive weed control is a relatively new market. While companies...
Read More