Dead-nettle?

Dead-nettle?

Observation - Dead-nettle?. Description: This was in long grass in a hedgerow along with Cow parsley and some nettles - see the last photo for scale. It has alternate leaves, square stem and flowers in leaf axils in a whorl. I don't think the leaves were strong smelling, but I didn't check.

This was in long grass in a hedgerow along with Cow parsley and some nettles - see the last photo for scale.
It has alternate leaves, square stem and flowers in leaf axils in a whorl.
I don't think the leaves were strong smelling, but I didn't check.
I thought it would be easy to ID later but I have failed.
Help please