Solved Help identifying this please

I've still got suckers coming up from some cordon plums I removed 4 years ago now, if you can pull them up, or dig them out rather than cut them off.

 

I agree it's not Japanese Knotweed as the branches have a distinctive zig-zag to them. I too think they are suckers from a tree.

 

I can vouch for there being absolutely no difference whether you tug the suckers off or cut them close to the woody root. The ****s come back anyway. Peach rootstocks are just as bad.

 

It looks a bit like cherry tree suckers. When we had ours cut down, suckers appeared in the grass all over the lawn until the stump finally died. Just kept pulling them out and/or mowing them, and they eventually stopped appearing. I'm certainly no expert, but the leaves on your plant look different to the leaves posted of the Japanese knotweed. Hope you get it sorted soon.

 

No expert, but they look identical to the cherry saplings I have popping up around my garden, sometimes 20m or more from the nearest cherry tree. I'm not sure if they are suckers from roots or if they've grown from germinated cherry stones - since I've seen squirrels, magpies and pigeons carrying cherries all over the garden.