When this subject last came up back in August I posted about my direct contact with Jaguar Classic Parts (ie. Jaguar-Land Rover). Following an email exchange with them I posted this comment: "FYI, Jaguar Classic Parts supplies the correct lower chain tensioner as Part # EAC3629 through your local Jaguar dealer, ie. Jaguar Classic Parts - EAC3629 is pictured and discussed in this thread in the last few months (courtesy bora492)
Here’s the link to the full thread: Which timing chain tensioner to use?
So, in short, the Renold tensioner (France) seems to be supplied directly through your local Jaguar dealer. It might be worthwhile contacting them to confirm availability.