Indeed.....

There must be tens of thousands of modified cars on the roads that would probably fail an IVA, and are, technically, liable to one. No doubt they get away with it because there's no real reason for them to get inspected, but an EV conversion is going to attract that attention, probably because it'll mean reduced tax revenue.

Can't see many people volunteering for an IVA. Does beg the question about insurance, but again, guess it's just not come up (yet).

All it'll take will be something like the incident that gave rise to the 'Part P' regulations for electricians.