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Ooh, lots of suggestions there, thanks, but I'm only interested in natives. :)G x
I would have gone for a Rowan or Sorbus. It is quick and most natives would be too big for the situation. Another one might be Bird Cherry. It has lovely sprays of white blossom in spring.
I've got a Stella cherry tree in my garden.
I think bird cherry is Prunus padus. There is another native cherry, Prunus avium, the wild cherry but that can get big. With cherries you must not prune them in winter, it has to be in spring or summer otherwise they are likely to be infected by a disease - I think it is silver leaf disease.