one of my mates seen it too, its a series 2. he seen the car at about 730pm and it was on the side of the road with no-one around, then it was gone later when he drove back past.
It was on the road coming from jesmond into town, just after the camera just befor it splits into 4 lanes for the lights.
btw, plate's read ###### *maybe i shouldnt say the plates here yet*