I may well go with a tracker solution but need to investigate options. I don't doubt that after-market solutions like the TRACKER Cat 5 are superior to the one Audi use but I need to clarify the warranty situation as I'm not risking that. There's also the issue of what happens on a PCP deal if and when you return/trade-in the car. Will they complain if the tracker can't be removed?
They wont complain, and the next owner with probably be thanking you!