Breakfast club is right round the back of the school so a fair walk from the school gate and you can't see the door from the pavement...DS1 is in Reception (but young - July-born) and I have always walked him round to the door.
The last couple of days I have seen him to the gate and let him walk by himself - although I do stand on the pavement and watch him until he disappears from view.
Not sure if this is ok or not - other parents do it but I know this doesn't make it right but it is a bit of a bind walking all the way round the back to literally say goodbye to him and then walk all the way back to the car.