The latest addition to Jaguar’s fleet at its Nürburgring Nordschleife engineering test centre is the brand’s very first taxi, albeit one with rather more ability than you may expect from a traditional cab. Jaguar taxi image gallery.It's based on the latest all-aluminium long wheelbase XJ Supersport with Sport and Speed Pack options, Jaguar’s ‘Nürburgring taxi’ boasts 375kWfrom its five-litre supercharged V8 and a top speed of 280km/g, but no fare meter… after all, a lot of the rides are complimentary.SURPRISING SUPERSPORTFrank Klaas, Jaguar Land Rover's head of global communications, said: "We’ve been running a successful Nürburgring driving programme from our Nordschleife engineering test centre for some time - it’s the very best place to demonstrate the dynamic abilities of the current Jaguar XF, XJ and XK models.“Of these models, we found it’s the XJ Supersport that most often surprises journalists with its speed simply because they perceive it to be a large luxury car. The XJ is both but its aluminium architecture means it’s rigid and light, too. Which make it a very good car on track. To underline that fact, our engineering team created this special 'Nürburgring taxi' version in which our trained drivers can safely take passengers on very hot laps!"Yellow or black might have been more suited to the car's function but Jaguar chose a non-standard matte grey paint with an exterior sport pack and very interior speed pack, the latter raising the KJ Supersport's electronically limited top speed from 250 to 280km/h. The car is, otherwise, mechanically standard.KIDDIE-SEATS FOR ADULTSThe normal sport pack adds sports front seats with the rear seats trimmed to match, along with additional discreet detail changes. The exterior sport pack adds a front splitter and extended boot-lid lip to maximise aerodynamic stability at high speed. It also adds red brake calipers, a gloss black finish to the grille and lower air opening and side vents, and 20" Venom five-spoked alloy rims that have a diamond-turned sparkle silver finish. Inside there's room for four, though the usual deep leather seats with their temperature control have been replaced with adult kiddie seats with four-point harnesses to keep its occupants securely in place during the very quick laps of which it is capable. each equipped.A full roll cage completes the interior changes and (in case you've never been in a roll-caged cabin, something for the humans against which to knock their crash-helmets.