Hi Marco
It certainly does look like you've had a bucket load of problems with cars lately.
I have to say, it was an interesting read, and humorous in places....didn't know whether it was best to laugh or cry!
It does sound like the Dealership is entirely at fault....lack of proper PDI check(s), sourcing a car that has been sat around for a year (probably because it was known for being faulty), etc.
I would correspond directly with Jaguar (UK) and demand they investigate the sales practices of their Dealer in Luxembourg.
Keep us update on the progress
Cheers Trevor