Bit rough of Ferrari to contest it but knowing how strict the FIA are with the rules, I could see this actually happening.

All over the news this morning: http://www.bbc.co.uk/sport/0/formula1/20531638

Does he have to be past the green flag before he can overtake, or does he just need to be able to see it?

Gutted I actually missed the race, seemed like a great end to an excellent season.