i asked the same question the other day
with my dad as the named driver and me as the policy holder, it was over £700
with him as the policy holder and me as the named driver it's just over £400
and i did a thing on the internet where the "with business use" quote came to £470 odd so i called to ask to remove the business and the quote went UP to over £600

madness, complete and utter madness

i've got a company set of wheels so i don't really use the car, but the best quote i got was with me paying NO EXCESS for an accident or claim other than fire or windscreen

the mind truely boggles