Aphid nymph? Shield bug?

Aphid nymph? Shield bug?

Observation - Aphid nymph? Shield bug? - UK and Ireland. Description: This fellow crept onto my hand as I was sitting on a picnic bench at The Lookout in Swinley Forest, Bracknell. The area is heavily wooded, lots of pine trees but deciduous as well.

This fellow crept onto my hand as I was sitting on a picnic bench at The Lookout in Swinley Forest, Bracknell. The area is heavily wooded, lots of pine trees but deciduous as well.