The Interceptor saloon had a distinctive large, curving wrap-around rear window that doubled as a tailgate. The original specification included electric windows, reclining front seats, a wood rimmed steering wheel, radio with twin speakers, reversing lights and an electric clock. Power steering was included as standard from September 1968.
The Mk II was announced in October 1969, revised frontal styling and vented disc brakes. The Mk III of 1971 had revised seats, fully-cast alloy wheels plus some other improvements. The Mk III was divided to G-, H- and J-series, depending on the production years. The "J" version of Interceptor III was the most luxurious Jensen built. Jensen were one of the first manufacturers to equip a production car with four-wheel drive, in the shape of the 1967 Jensen FF (Ferguson Formula). At the time it was hailed as a remarkable development, coming also with anti-lock brakes and traction control. The car was four inches (100 mm) longer than a 'standard' Interceptor, with the addition of two side vents on the front flanks. Press from the time quote "drag-strip" performance when describing the car. 320 Mk I, 109 Mk II and 15 Mk III FFs were made.
A convertible with powered soft top was introduced in 1974 mainly intended for the American market but also sold in Europe. 267 convertibles were made. Rarer still is the Coupe version with just 60 made, derived from the convertible and introduced in 1975, just a year before the company's demise. It could be said though this version detracted from the rakish, stylish looks of the GT.
The Interceptor was briefly re-introduced in the 1980s as the Series 4 (S4), as a low-volume 'specialist' motor car in much the same way Bristol continue to market and manufacture their cars. Though the body remained essentially the same, a newer, so called 'cleaner', engine was used and the interior slightly re-designed with the addition of 'sports' front seats as opposed to the armchair style of the earlier models. It wasn't to be, however. The then owner sold up in 1988 to an engineering company believed to be in a stronger position to manufacture the car which lasted until 1993, and they did commence development work on a Series 5 (S5) Interceptor until once again receivers were called in. The end of "Gentleman's Express".