Have you ever pressed "Send " and one nanosecond later wished you hadn't? Or "replied" when you meant to "forward" with a trenchant comment?
Or sent a late night PM which was meant to beabout a GN member, to that person instead?
I imagine there are quite a few of us who would welcome an "Oh sh*t" key on our laptop! 
Evidence on Andy Burnham's National Care Service proposals
What's the worst sandwich filling?
Burnham to tell schools in England to adapt teaching to local business needs- what do you think?


and 


, to click on 'reply' instead of 'forward', so that said email, instead of going onto C, with, as Soutra says, a sharp comment, goes back to B instead. You might not have wanted B to see the sharp comment that was intended for C's eyes only.
