Works for me Colin, As the car is a recent purchase and the drivers manual is a little sparse on DEF instructions I had no idea as to how much was in the tank, if I should I top it up or wait for a dash warning light? Being a little concerned with some previous posts on this subject i was Just trying to get all the info to make an informed decision. That's now be done by Jaguar and the folks on this forum so will look forward to trouble free motoring for at least 12 months!!!!