Hi Julie, I take it that there was no message/warning light. The handbrake on the 1999 s type is not the electronic one, and if it was released properly it should be OK. Was the car rolling OK when in neutral? But, and being absolutely serious, small animals/birds have been know to nest or get into cars when they have been sitting for a week or so, and if the wheel was not hot, you might have been cooking a mouse!! I will check on the white smoke and get back to you. Regards, Peter.