Thank you for the comprehensive reply. I can now understand why you want to remove the paths completely, though from a "mapping" point of view, it's perhaps more helpful to leave the paths in, even if their access is removed, as visually (especially in the aerial photos) they'll still be there for a while and there's a danger people will try and add them back.
For interest, will there be any pedestrian route down West Kennet Avenue, as without the path won't people now be walking down the road to see the stones?