In passing, I note that roughly 3 million people were evacuated from city centres in WW2.
Unfortunately, when nothing happened for a while almost half of them trickled home just in time to get zapped in the Blitz.
Perhaps this is just one of the reasons HMG has not followed much of the advice of the man on the Clapham Omnibus (just yet) to do all the things which seem 'obvious'?
Nudge, nudge,