Mothers front door opened outwards, it had to, or she would not have got out of door with wheel chair, her vestibule was smaller than our house and it could have never opened inwards.
I looked for a new door, and it seems to depend on the amount of glass, fensa or something means if more than a set amount is glass it needs registering, so under that the local builder could fit it, and he was far cheaper to window people.
However if I had an outwards opening door, I would need to exit the house by another door with parcel delivery, when lived in mothers house delivery drivers would knock the door and wait, today they dump them in front of the door, take a picture, then send a text message. So we would not be able to open the door if it opened out.