Afzal Kahn insists the road is his catwalk and true to his mantra  the iconic British designer has given the thumbs up to an ambitious development which ensures the BMW 5 series receives an imposing makeover and plenty of visual presence by way of the 10x21 and 9x21 RS-XF 10 x21 RS-L and 11x20 and 9x21 RS-X wheels – designed by Afzal Kahn to gauge maximum durability