Just been under the bonnet checking levels etc. now the cold weathers arriving. While I was there had a quick look at the ECU.
This answers the question of how to tell a euro 6 car.
last 5 digits on the top line of the ECU label (just above the bar code) say EURO6
I've taken some photo's not very good I'm afraid so you'll have to take my word for it.
Or you could just ask the dealer