I know nothing about Jaguar paint, but Meguiar's #80 followed by NXT 2.0 has worked for me on black vehicles.
The #80 is not real aggressive which I like. Takes a little longer, but you don't mess anything up
As far as #7 Showcar Glaze, I have never been able to get it to work on anything. It probably is user error, but by no longer being a user, I eliminated the problem

Bought it once, didn't have any luck, gave it away. I was told I didn't use it correctly so I bought it again. Had the same luck, (bad

), gave it away again. It's not gonna happen a third time.