VW group vehicles can be modified via software called VCDS. It can also check for, and clear error codes. Simple things such as how the sunroof opens when the car is unlocked to calibrating a new installation of bi-xenon headlights or removing annoying seatbelt chimes can be done with it.
Is there equivalent software for Jaguar vehicles?
Also, are their self study documents available from Jaguar? Basically technical documents used for background information/introduction to Jaguar's logic for using certain technologies in each vehicle.
Like this document for example from VW explains how dual charging works in their engine: http://www.volkspage.net/technik/ssp/ssp/SSP_359.pdf