Mum has just bought a new car and I'm in the process of helping her find the best value comprehensive insurance online.
Going through the fine print of the PDS, most insurance companies offer a new for old replacement for a new car in the case of a write-off within the first 2 years.
Hence, is there a reason for insuring the new car under an agreed value at all?
assuming your mum is the first registered owner (ie the car wasn't a demo), then for the 1st 2 years, no reason to do anything more than market