Les Hemmings writes
K wrote:

What shape? Plum shape or rounder? Could be cherry plum - myrobalan

http://en.wikipedia.org/wiki/Cherry_plum

Sure this is it. Nice one K. They are used as a hedging / tree locally and
no one eats them. So much fruit that branches droop and piles appear on the
floor. We're doing our best but there is only so much you can eat, jam,
freeze etc.

I'd have thought cherry plums were smaller than damsons. But they are
used as hedging.
--
Kay