Seems a good way for a company to get a supply of decent repairable bikes/cars on the cheap.
I get that, but honestly don't understand the mechanics (and legality) of it.
Thankfully I had zero dealings with insurance in the UK (apart from setting it up). Had a massive crash back in the day in Italy where my R1150R got totalled, I do still have the bike (half of it to be fair) and it is registered. I got paid out at the time, the insurance paid the bike in full at marked value and couldn't care less about the bike registration itself. The wreck was mine to keep and do as I please.
I do understand and appreciate the plate system in the UK where it's clear if you get a previously written off vehicle.
But I do not understand how an insurer, or worse, the claim management company takes the liberty to write off a vehicle without asking or getting written approval from the owner first.
Only experience I had has been with my GS over the years, following a couple of mishaps (one big-ish, one very minor), both times a dealer told me to call the insurance and have it written off. Both times I put my time (and money) in and got the bike fixed. Damage was my own fault, I sorted it.
I can imagine if a claims company was involved and they forcefully wrote off the very bike I am traveling with at the moment, I'd be severely pissed off. The bike is my property, you ask me first. Especially with the habits we see of vehicles being written off for menial issues, minor/cosmetic damage.
Apart from that, I second Wapping's opinion in the post above.
There have been a few articles in newspaper in the last year regarding the cost and practices of motor insurance, time might be right for a follow up.