you may find that more people are buying shoes from today following the expansion of ulez. it ll become the world s largest clean air zone, and means owners of the most polluting vehicles will have to pay £12.50 a day, while driving in the area. there are benefits for health and air quality but the policy has also proved to be very controversial. joining me now is carlton reid, longtime transport correspondent and sustainability contributor for forbes magazine. if you go to glasgow the fee is £60, if you go to paris, many global cities have done the same thing. the fee in paris is 135 euros. £12 50 in that context is actually something that context is actually something thatis that context is actually something that is a bargain, to be able to pollute. it is almost a licence for