A previous Post states:-
If you want to "incite" the car to do it, run it under 1/2 a tank of fuel and go around tight corners reasonably fast (not crazily fast) while accelerating. From my observation that can tend to make it happen more often.
Thanks Dazz, this is exactly what happens to me, maybe the Female Receptionist would do a lot better if She listened to my input, rather than simply "booking in". Her husband seems to be the Technician, my recollection is that it never happened when topped up, which it usually is.