Julian, while SOR might be a better option for the trader, I have heard of one Morgan owner who had some degree of complexity in receiving the funds from the sale, and in the end did not receive the full amount, and took another car from the trader to make up the approximate value expected...
Also there is a rather long running story in the Porsche world of an English trader who got up to all sorts of tricks with cars both in for repair and SOR...The numbers and antics were staggering...
So it would seem to have some sort of insurance on your vehicle that might cover any situation when in the hands of a trader, as it seems one Porsche owner seems to have had...
Might be best to be careful out there in a falling market where traders may be struggling..?
