Italian design house Zagato has developed a unique coachbuilt body for Bentley’s new Continental GT Speed, which it plans to unveil at next week’s Geneva Motor Show. Labeled the 'GTZ', the modified Bentley is just the latest in a long history of coachbuilt cars from Zagato including last year’s Diatto Ottovù and previous works from Ferrari, Aston Martin, Jaguar, Rolls Royce and MG.