How does the British government propose to force teachers to teach there for five years? How would it work physically? Or would they refuse to allow teachers to come back to Britain without paying the price of their State teacher training plus interest?
It seems an odd kind of idea. In Ireland, where we have had haemorrhaging emigration since 2007, the attitude is that if a teacher teaches abroad for a few years s/he will come back with experience gained abroad and a broader worldview.
We have the same problem with greedy doctors; a matter of our attitude to money having been warped and infected by Thatcherism, in my view.