Bee or wasp with red abdomen

Bee or wasp with red abdomen

Observation - Bee or wasp with red abdomen - UK and Ireland. Description: This medium-sized bee/wasp had a striking abdomen pattern - obvious narrow waist between thorax and abdomen which doesn't really show on the pics, so not a sawfly I would say. Very robust antennae. Visited flowers but not obviously feeding on nectar or po

This medium-sized bee/wasp had a striking abdomen pattern - obvious narrow waist between thorax and abdomen which doesn't really show on the pics, so not a sawfly I would say. Very robust antennae. Visited flowers but not obviously feeding on nectar or pollen. Any ideas?