I'll get a cup of tea your head gasket has gone (back LH corner looking in from the front). If you have not used all the oil (it would seem not if it starts doing it again!) then it is unlikely there will be any further damage. If you *really* need to start it again top up the oil first. To stop it, put the handbrake on and the footbrake, stick it in 5th and let the clutch off - it will stall easily. Allow a bit of space in case the hadbrake's not
100% - there's no need to go into trees etc.This is a well know problem at the sort of milage you car is at, and while being a bit scary don't panic! Bearing in mind the possibility of having burned all the oil (that's what the vast smoke cloud was), a new head gasket is all that will be required
- it most likely won't happen again.
Richard