The 1990 Kensington concept car was created by Italdesign and based on a contemporary Series III Jaguar XJ12. It was shown at the 1990 Geneva and Birmingham auto shows.
One could argue, as Top Gear does, that creating a new concept car for a major car maker, without being invited to do so, is the automotive equivalent of of camping outside someone’s office until they give you a job. Only in this case, Jaguar didn’t bite.
That said, it was a modern design, and in some ways it foreshadowed Jaguar’s X351 incarnation of the XJ, introduced in 2010.
Even though Jaguar didn’t bite, the concept wasn’t a complete failure for Italdesign. It ended up going into production as the Daewoo Leganza in 1997. No V12 engine, though.