The jag "incident" was the last journey for the v12 xjs that TG "tuned" can't remember exactly what, nitrous perhaps.
They had previously raced it against some more modern machinery, they then decided to race it against a Jaguar (?) on a HMS aircraft carrier.
However "stig" didn't brake in time and the Jag didn't float.
Some might say another piece of envirmental vandalism from the BBC, but its probably now creating an artificial reef!