Why is there a ban on junk food ads and does it apply to Scotland?

The UK Government is set to ban TV adverts for food high in fat, sugar and salt before 9pm, but will the changes apply to Scotland?

Why is there a ban on junk food ads and does it apply to Scotland?
The UK Government is set to ban TV adverts for food high in fat, sugar and salt before 9pm, but will the changes apply to Scotland?