- Registered new in New Zealand

- Restored in Australia with louvres, rear arches and PAS fitted

- Green with red interior

The retrospectively named 'Mk 1' made its debut in 1955, powered by a 2.4-litre short-stroke version of the XK120's twin-cam six-cylinder engine. In early 1957, the model became available with the larger 3.4-litre unit developing some 210bhp which had already appeared in the Jaguar Mark VIII. The 3.4 had a larger front grille for better cooling, a stronger rear axle, and the rear-wheel covers were cut away to accommodate knock-off hubcaps. Mark I 3.4 saloons competed successfully in competition in period, notable drivers including Stirling Moss, Mike Hawthorn, Tommy Sopwith, and Roy Salvadori.

991 UYT was sold new in New Zealand and first registered in December 1958. In the 1990s the car was taken to Australia by its then owner where it received a cosmetic restoration covering the interior and a respray in metallic green. At the same time, it also received coombs style rear arches and bonnet vents, together with the addition of power steering. It returned to New Zealand in 2006 before being imported to the UK in 2016. The vendor advises the engine, gearbox and body number all match and other notable features include red tipped needles and a low fuel warning light as fitted to SE models. A large history file accompanies the car.