The message
from Janet Tweedy contains these words:

I prefer to stick with fairly normal trees for
Britain just because it gives the insects and birds something to feed on
generally, but thanks for the offer Jim.

How about one of the mountain ash/sorbus family? Flowers, pretty
leaves, reliable fruit, autumn colour, feeding birds, rock hardy, no
mess, not too big, and non-invasive roots. Choose your fruit colour from
white, pinks, reds, yellows, gold, orange.

Janet.