Tree surgery is unregulated. ARB Approved is the gold standard, and the public actively checks the register.
Tree work is one of the most unregulated trades in the UK. Anyone with a chainsaw can advertise tree-felling services. That makes ARB Approved Contractor status (the Arboricultural Association's vetted scheme) unusually important.
The Arboricultural Association explicitly markets this to consumers ("if you think CORGI for plumbers, think ARB for trees") and provides a public Find a Tree Surgeon directory. We link it. Customers verify your status in two clicks. Combined with named NPTC chainsaw certs per team member, it's the credibility customers actively look for.
Source: Arboricultural Association. ARB Approved Contractor status reassessed every two years. Public directory at trees.org.uk.