 The AC 428 coupé sported a recommended UK retail price of £5,573 (including automatic transmission), to the manual transmission Aston Martin DB6's £4,460 - itself roughly twice that of a 4.2 litre Jaguar E-Type roadster at £2,225.Towards the end of the production run a couple of prototypes for an extended range were produced.There was a four-door version of the coupe and a more streamlined version of the convertible that included electrically operated "pop-up" headlamps.