I mentioned this in another thread but it was probably missed.
I noticed eventually that the drivers you scout in your academy will be the same nationality as the manager. On two of my accounts I am scouting drivers who are a nationality that I was in the past but not currently.
Btw for the record I am trying for nationalities that are in the game, i'm not trying to get someone from the South Sandwich Islands or something silly
I don't think the game is setup to give driver and staff for all the countries.
This account from the start has been Philippines, but drivers and staff I started with where all British.
My TD's contract runs out in 5 days most likely I will be given a British replacement.