Jeff wrote:

Even for an American in the UK, that would be the best approach, as
radios not specifically approved for PMR 446 are not covered by the
class licence.

That is not the case, type approval went out of the window some years
ago now. The radio but just meet the relevant Interface Requirement.
Specific approval is not required.

Unless Ofcom has failed to update their information, it also has to have
things like a permanently attached antenna, absolute power limits, etc.,
basically to make it non-trivial to modify outside of the specification.
As pointed out elsewhere, the proposed equipment doesn't comply with
those conditions, so wouldn't have been legal for PMR 446 use.

I used approved loosely, to mean designed to meet the conditions of the
licence exemption.