I am now quite sure that car is a 2012 Nissan Qashqai. One overtook me in stop start traffic today and the wheels with raised edges on the 5 broad spokes , rear light with a transparent inset, deep roof spoiler, shape of the body join with the bumper panel, shape of the side panel by the rear window etc were all just right.
The mystery has been niggling me - but I am now gonna leave it alone. Unfortunately the Nissan web site now shows the newly face lifted model with some fancy wheels. But the rear bodywork has not changed much.