Touch typing
Listening skills, negotiation skills, presentation skills
Physical activity every day for every child (not just playtime and not cancelled for every sodding play rehearsal etc)
Cooking from primary age, and no I don't mean making flapjack, I mean proper cooking of meals.
Less focus on handwriting, especially joined-up handwriting
Play-based learning throughout KS1
More imaginative art, rather than 30 primary aged children all making identikit pictures.
Oh, and not strictly national curriculum, but class sizes of 15-20.
Shorter summer hols, and more consistent high-quality breakfast clubs (not just serving shit cereal, but porridge, fruit yogurt etc) and proper universal after-school care not run by bored under-qualified late teens/early twenties. So yes, I guess extended days.
I would also make school lunches compulsary, and cut down the cake content.