Willow Mason Wasp Symmorphus bifasciatus
This was found on a Hogweed flower and I keyed it using the RES Handbook to the Vespoid Wasps by M E Archer. The forewings were 7.5mm long.
female Willow Mason Wasp Symmorphus bifasciatus showing wings, head in front of ocipital triangle, pronotal ridge, first gastral tergite and haors on edge of first gastral tergite, Wendling Beck Environment Project (Norfolk, UK), 18th July 2025