Hello Laurence, with my XJS (1996 / Celebration) the inner sky was renewed. You can do that without removing the convertible roof.

Here in Germany I know a company that specializes in it –
https://www.ck-cabrio.de/verdecke/cabrioverdecke-von-a-z/jaguar-xjs-convertible-verdeck-1988-1996/

Uwe Albrecht