DV, not wanting to split hairs where lives are concerned and not wanting to play numbers games with such a serious question as safety, but, as far as I know the last mid air collision involving a Tornado before this event was in 1990. Therefore, whilst CWS might have prevented this accident it might not prevent the next one. Pro-active safety with finite budgets is about making choices and it how the choices are made that is, for me, the most important thing.