There are surprisingly still a fair amount of "recent" Rover cars running around in and near Rennes - an MG version of the Rover 25 turned up recently at our monthly classic car get together - we put cars of that age into our "youngtimers" section.
If it's in reasonable condition it would be a pity to see it go for spares and scrap. No idea where you are based in France but there is an association of expats in central Brittany that helps people get their cars registered. Have a look at their web site :
Association Intégration Kreiz Breizh
I've only got experience of registering a classic car over here - it wasn't difficult.