In Europe the 4.2-S was unveiled at Geneva on March 1, 2005. This was the last XK to be rolled out that was based upon the original 1996 design. Features for the 4.2-S Four included new exterior and interior colours and two distinct veneer options for the instrument panel, polished door treadplates with chequered-flag emblems and embossed, leather-edged floor mats. The revised white Jaguar badge on the bonnet also feature chequered accents. New 19" Atlas wheels plus cross-drilled Brembo brake discs, red wheel badges and red brake calipers were also fitted.
Jaguar also produced a concept car called the XKR-R which was very similar to the production XKR, but boasting a more powerful 450 bhp (340 kW) engine, a manual gearbox, a limited-slip differential and improved handling. The naming convention is similar to that of the S-Type R special edition. Unlike the S-Type R, it will never be realised on a Mk.1 XK chassis although a model of the same name could appear on the Mk.2 XK later this year.