Our car is insured with
https://www.classicinsuranceservices.com/contact-us/i worked in the insurance industry for most of my working life and they were recommended. They certainly discuss requirements in a knowledgable way.
Our car is not whole yet and the bits are spread around various places, but they are all covered.
My kids have a motor trade policy through them for their classic car trimming business, and they are quite happy with them
Never had a claim though.
Other than having a policy with them I have no other affiliation with them.
Nick