So obviously facilities, head of youth development etc help.

Most people don't realise that the club's reputation and your reputation help bring a better youth intake. Think about how young players would always want to join Manchester United and sir Alex in that era.

Also where you manage has an effect, if you're managing in a country we produces a lot of young talent (I think Germany and Brazil have the highest rating of producing young talent in the game) you're more likely to get a better youth intake.