The first 2 pics are of the same plant/tree it has grown a huge amount in one season and is obviously something that has set seed and not actually been planted.
3rd pic, it looks familiar but I need some help. It's been flowering for a long time now and is still going, upright habit, not much more I can tell you.
4th pic, flowering now, herbaceous perennial I think, its growing in pretty dense shade.
Thank you so much, it's driving me mad not knowing what they are.