German car maker BMW has built a 21st-century version of its legendary, late-’70s M1 supercar, writes JEZ SPINKS.Rumours of a new BMW supercar have been reignited after the German car maker revealed a concept car to mark the 30th anniversary of its first and only mid-engined car, the M1.BMW used last weekend’s Concorso d’Eleganza Villa d’Este exhibition in Italy to unveil the M1 Homage,