Are there any arboriculturists here?

[Frith2013]

Does anyone know if this is a walnut tree or an ash?

I did plant a walnut tree but wasn't sure it survived. There are self seeded ash too.

Thank you.

It looks like a walnut to me. What colour is the stem? Ash is very pale green with black buds.

Here's a photo of the stem with an annoying molehill!