Pseudocistella ceramboides
Apparently not a very common species.
This came to light in my garden. It reminded me of Isomira murina but with strongly serrate antennae. It was also quite a large insect (about 10mm), the apical maxillary palpomere was big and the eyes were more incised.
Pseudocistella ceramboides, North Elmham (Norfolk, UK), 31st May 2025