Assessing Organisations can assess practitioners for the various role standards. The roles they can assess are shown alongside their listing.
(In alphabetical order)

Association of Pet Behaviour Counsellors
www.apbc.org.uk
Animal Behaviour Technician (ABT), Clinical Animal Behaviourist (CAB), Veterinary Behaviourist (VB)

Association of Pet Dog Trainers
www.apdt.co.uk
Animal Training Instructor (ATI)

The British and Irish Association of Zoos and Aquariums
www.biaza.org.uk
Animal Trainer (AT), Animal Training Instructor (ATI)

Dogs Trust
www.dogstrust.org.uk
Animal Trainer (AT), Animal Training Instructor (ATI)

Gundog Trainers Academy
www.gundogtrainersacademy.co.uk
Animal Training Instructor (ATI)

Karen Pryor Academy
www.karenpryoracademy.com
Animal Training Instructor (ATI)

Natural Animal Centre
www.naturalanimalcentre.org
Animal Training Instructor (ATI)

National Institute for Canine Ethics
https://www.nicemembership.com/
Animal Trainer (AT), Animal Training Instructor (ATI), Animal Behaviour Technician (ABT)

Professional Association of Canine Trainers
www.pact-dogs.com
Animal Training Instructor (ATI), Animal Behaviour Technician (ABT)

Puppy School
www.puppyschool.co.uk
Animal Training Instructor (ATI)

The Canine Behaviour & Training Society
www.tcbts.co.uk
Animal Training Instructor (ATI), Animal Behaviour Technician (ABT), Accredited Animal Behaviourist (AAB), Clinical Animal Behaviourist (CAB)