I bloody love Jags me. Especially the S-Type.
The XJS was a horrible thing. They were huge on the outside, cramped on the inside, heavy, massively thirsty, and not really very fast. And they were not elegant like the E-type and XJ saloons. I remember reading that some motoring journalists were visiting Jaguar back in the 70s and were left unattended so they wandered into the design studio and saw a mock-up under a sheet. The took a peek and decided that it was so hideous that it couldn’t possibly be intended for production, so they didn’t even bother taking photos. Then, to their surprise, it was later released as the XJS.