I happened to see a mention of someone who does a bluetooth conversion of the OEM radio in the X300 on a "book of faces" post.
However there was no mention of actual contact info other than to say this could be found on evil-bay
I have searched there for "Jaguar radio bluetooth" but so far I have not found anything.
Anyone know anything about such a conversion?

I have in the past put an aftermarket radio in a XJ40 car that I own but I was never satisfied with the look of the resulting change in radio head units.

 

Bluetooth transmission is missing the full input signal ( this has to do with data or refreash ( ? ) rate ) so a direct inline plug is better

There or some post on the inline jack you can solder in ( original Jaguar head ) losing the cassette function

 

Are you saying that others have made posts about how to solder in an aux jack in place of the cassette function?

 

Yes

 

I have used a similar device in both of my Jags, works great....

 

https://www.discountcarstereo.com/bt2-jag97.html

https://jagaux.com/

 

Thank you everyone who has replied to my post. This information is very useful.

 

The other mod is tapping into the cassette circuit with a jack soldered into the cassette head pickup , this will be your free input line this is direct with no signal loss or compromise but losing the cassette . This is no cassette device insert but you place a tie wrap on cassete carriage inside to mimic the cassete needs to be alive

Marks device will plug into the 8 pin DIN plug at the original head and if you have the external in the trunk final stage amplifier ( premium Jaguar stereo option ) you would loss that and would have to use the original built speaker outputs coming out of the rear AJ9500A