I do wish papers would stop printing such biased nonsense. Of course 2/3'rds of our millionaires didn't just leave Britain. It defys common sense to even suggest it.
What has in reality happened is people have understandably done what they can to minimise the tax they pay.
The 'temporary' 50% tax band was a stunt. A political booby trap which in my opinion was fantastic bordering on political genius.
It played nicely into your traditional Labour supporter and was something your average voter wouldn't be bothered about. Certainly nowhere near enough to write to their MP. At the same time it would be politically impossible for the Tories to remove but Labour could if they'd have won the last election by reminding people they'd said it was temporary all along.
The downside of course is that Labour firmly put politics above national economic interests. It makes absolutely no sense to have a 50% tax band since it raises at best a paltry amount but drives people to avoid it and/or not bother coming to our shores in the first place.