Rose hip bug

Can anyone identify this leaf bug? I was photographing the rose hips when I spotted it.
EDIT: Thanks to blipper Kathb, who discovered this is a late instar nymph of a box bug. 

This afternoon we bade farewell to De Haan (my Extra) back to the same room in the same hotel in Bruges for a couple of nights. We're travelling home on Tuesday to avoid British bank holiday trains. The family drive home across the car ferry tomorrow. Too tired to do much this afternoon, but hope to pack a lot into tomorrow.