I agree with welshonion about the oak, if you've room have a tree. Having said that, if you have a tree you won't have good hedge to each side eventually, it'll be shaded out. Hawthorn is a good base for hedge you want lots of that, it's reliable, grows and thickens up quickly. Hazel coppices well so if it gets thin at the bottom you can cut it back to start again and make thicker growth. Alder and blackthorn and some of the dogwoods sucker, that's good or bad depending on how much space you've got. Holly is a bit slow and can get lost. You'll have a reasonable hedge in 5 years (if you have enough hawthorn) praps sooner. In 10 years it will be great. Don't be tempted to let it grow up to get height quickly. It won't thicken up if you do that. Cut it.
Don't let ivy move in to start with. A mature hedge can cope with a bit and it's wildlife friendly but can seriously compromise a young hedge.
What else have I learned over the last 20 years of hedge? Watch the dogrose, it puts out long, painful growths to smack you in the face. Ditto brambles but blackberries are good. Old man's beard smothers. Can't think of anything else at the moment.