According to today's Auto Express Car Tax band is ' C ' for the Cooper 121-150 g/km (£100) rather than 'E'

GOOD NEWS saves fifty pounds. My dealer now owes me £50 on the invoice
Also very positive report, 5 stars, improvements all round. 48 mpg

, Corners like a go-kart!
The S appears to be just in band D (<165) @ 164 g/km £125 both Cooper and S now on DVLA site.