Potato Capsid (Updated)

I'm sure this is the same shield bug that I photographed 5 days ago. It looks very similar but just a bit darker, so getting it's adult colouring... So, perhaps it's not a Common Green Shieldbug after all - in fact, I'm now leaning towards the Closterotomus norwegicus Potato Capsid. I'm waiting to hear from the helpful bug people...Update: Yup, they confirmed it's the Clostetomtomus norvegicus.

Although it's known as the 'potato bug' I can't see anywhere that it damages spuds.