Car was parked on our quiet drive overnight and in the morning I noticed the passenger window had shattered into the million little fragments. However it was completely intact with no sign of force being applied to the window (or the rest of the car). On lightly touching the glass bits easily fell into the car so I'm happy (apart from the cost!) that it has shattered due to internal stress or similar - though why? Weather benign - not cold or hot or windy, car on flat level surface and I haven't been on the WalesGB rally or similar so car not stressed especially either. Probably never know but will ask the repair guy in the morning.....