Nobody has mentioned the ADAC model in Germany (or ANWB in the Netherlands) under which HEMS is provided as a function of car/life insurance as a small levy on the policy.
The problem for the UK is the tax, EU levies, policy increase due to fraud and everything else that's loaded into already an already expensive policy.
I don't have any issues with a centre of excellence for HEMS as such; my ask would be that it acts in support of standardisation across the sector and supports common rules, operating procedures and methodology.