The Ferrari was the easiest of all, originally with Aviva direct with the old one then when they insisted on a tracker, I changed to Admiral. Admiral insured me for around £500 and added my son (23y.o.) for around £200. It was incredible value and although I’ve never experienced a claim, each time I phoned I had a real person, knowledgeable and helpful. That included across Europe driving, commuting, autobahns street parking on holiday and still no tracker required.
The Morgan is still with Aviva direct, about £400 for the two of us. Those mainstream outfits would do the Caterham so it’s done through a broker “be wiser” he’s always been pretty decent, it’s about £400 too if I recall correctly.

I can only assume the algorithms make the Ferrari the lowest risk, after all, who in their right mind would give their 23yo son a 700hp £180k Ferrari to drive as fast as he can on the Autobahn 😂 (138mph was as fast as he could!)