Grundy: [Y]our collector car must not be used as a daily driver.
yes you need to show you have another car that is categorized as your DD....but there is no restriction, miles, and you can drive your car everyday if you choose. Grundy will also insure your modern DD car.
I have considered switching my "regular" car to Grundy but it is bundled with a multi policy for my house so that lowers the cost for that auto and home policy. However, that 2021 car which cost $43k OTD when I got it new costs over double to insure than my 3 classic cars insured for $140k with zero deductible. I suspect the Grundy inclusion of my DD would be less than 1/2 what I currently pay and my home insurance would not go up that much.
My initial post was to note Grundy does not have an annual milage restriction. In the years I have had Grundy coverage on my collector cars, they have never asked for odometer reading.
IMHO the majority, if not all, of us who have a classic car, we do have a more modern car also used for work commute, etc., but that does not prevent daily use of driving the classic if you chose. There is language in policy that outlines use not permitted like commuting to work daily (read occasionally is fine)