Wasp that looks like Ant Alate?
Family: Chrysididae (Cuckoo Wasps) Subfamily: Loboscelidiinae
Genus: Loboscelidia
In dunes, on sand by plant litter. A wingless wasp grasping onto a larval beetle host.
same locality: https://www.inaturalist.org/observations/46432233
In megachile parietina nest. Very large compared to British cuckoo wasps I know