The Jensen FF was a four-wheel drive (4WD) Grand Tourer (GT) car produced between 1966 and 1971. It was the first non all-terrain production car equipped with 4WD and an anti-lock braking system — the Dunlop Maxaret mechanical system used hitherto only on aircraft, trucks, or racing cars. An experimental system was first fitted to a CV-8, based on the chassis of the Jensen 541S, but this did not go into production. The use of four-wheel drive preceded the successful Audi Quattro by many years.
The letters FF stand for Ferguson Formula, after Ferguson Research Ltd., who invented the car's four-wheel drive system. The FF was related to the similar-looking, rear-wheel drive, Jensen Interceptor, but is 127 mm (5.0 in) longer, and mechanically very different.
Source: Wikipedia, 2011