Ref. BBC report and CAA comment re. flight plans.
When touring Southern Ireland last year and questioning why we had to file VFR flight plans, we were told that following a similar sort of accident to this had led to ALL flights in Southern Ireland require a flight plan. (I also seem to remember being told that there was a public outcry that someone could be left on a mountainside without anyone knowing).
That's not to say it will prevent CFIT accidents, but it might just provide help to someone seriously injured in such an accident who may otherwise die if left longer without help.