Why Ian Callum’s Jaguar XJ220 is only half revealed

Ian Callum has redesigned the Jaguar XJ220 but shown only half of it. Here’s what we know about the reworked supercar, and why teasing it works so well. Callum’s studio has put out a single image of a reworked XJ220, and it’s already all over motoring news feeds despite giving away almost nothing. There’s no…