Birch tree - Downy or Silver?

Birch tree - Downy or Silver?

Observation - Birch tree - Downy or Silver? - UK and Ireland. Description: Tall slim tree with largely silvery bark and thin leaves. Soft hairs on leaves, stems and twigs - Downy birch? Or are hairs present on young twigs in Silver birch too? I think it is a Birch tree but am unsure which and would welcome guidance please.

Tall slim tree with largely silvery bark and thin leaves. Soft hairs on leaves, stems and twigs - Downy birch? Or are hairs present on young twigs in Silver birch too? I think it is a Birch tree but am unsure which and would welcome guidance please.