Spider-hunting Wasp?

Spider-hunting Wasp?

Observation - Spider-hunting Wasp? - UK and Ireland. Description: Would appreciate thoughts on this one. Wasp-like insect on under storey leaves in deep shade. Very spiny legs. No really good wing shot, but you can see several dark patches present. Abdomen slightly longer than wings, mostly black but with white stripes.

Would appreciate thoughts on this one. Wasp-like insect on under storey leaves in deep shade. Very spiny legs. No really good wing shot, but you can see several dark patches present. Abdomen slightly longer than wings, mostly black but with white stripes. Distinctively marked legs. About 12mm maybe. Ideas?