Frank Stephenson, designer of iconic car designs; the Mini, Maserati MC12, Ferrari F430 & FXX and the McLarens P1, 675LT, 570S & 720S, was also the Cosworth designer. He originally drew on an aerodynamically 'Fokker DR-1 Tri-wing' spoiler design on the race car and for the road car. The Ford bean counters deleted his third wing, it cost 5 deutschmarks too much!
Wheeler Dealers' RS Cosworth episode, Ant Anstead fabricated the third wing! @4:40