Medics on the march

Today in London hundreds of medical staff are protesting about the way in which junior doctors are hired.

I have seen footage from the march on two television channels and the people who are marching are predominantly white. On the rare occasions I have been to a hospital (to visit the sick) or go to a GP (although at the moment I don't have one), the vast majority of doctors are coloured.

So what happens to all the white ones? Do they all end up in private practice?