It all depends what the car has been mapped for and the window of the mapping. If the Lambo had been mapped for the UK on 95RON, and if it wasnt able to advance the timing, then there would be no point in shoving 99RON in it. The Zed is mapped for 98RON, so putting 95RON in will lose you power and fuel efficiency. Maybe it cant tweak it for 99RON, but it at least has the timing mapped for 98RON. I also beleive its mapped for 101RON in Japan so it can probably at least handle that.
As I've always said, try it out for yourself and see. Dont listen to forum BS