Posted: 14/07/2013 at 20:01
Sounds like bird cherry Prunus padus. I had two on common land just outside my garden and the runners travelled so far!!!!!
I would wait and see whether it is or not. Try a cherry...sour? bird cherry.
I hate to say get rid of a tree but it will grow enormous if you leave it. Certainly not a tree for the garden unless your garden is big. Birds probably put it there in the first place.
Make up for it by replacing with something more appropriate but still good for wildlife but don't plant anything until you have dealt with the runners or you will just have more cherry trees growing.
Afraid you will have to dig them out