If "your other car is a Landie" then you probably own or have heard of the GAP IID diagnostic tool and how useful and easy to use it is. Well they have been rumoured to be working on a Jaguar version (I think they bought an XFR) and it looks like Christmas in July based on Pat's post in the UK LR/Disco forum here:

DISCO3.CO.UK - View topic - GAP Diagnostic Announcement-2016-07-25-Apple App & More

I'm contacting them to see what I need to do to add my 2010 XFR to the LR3 license (they say no need to buy two different units) and I'll keep the group updated...