Any such scheme that I would sign up to (such as https://carclub.easycar.com/) would have to have driver insurance handled as part of the transaction.
even with that, you’re not allowed to insure a vehicle twice, so I don’t get how it works.
reading the FAQ’s
This insurance cover works in parallel with your existing car insurance (which you legally must have in any case), replacing your car insurance for the period of the rental.
I’m sure should there be a claim the insurance companies will have a fit for not telling them that your vehicle has been used for hire and reward during your ownership…
Anyway, as stated above, it will get trashed by unts(C) like me anyway so I wouldn’t bother..