It might be this Cerceris arenaria (Sand Tailed Digger Wasp), it fits the habitat and Naturespot quotes -
"The prey species are various weevils. Nests are deep burrows dug in the soil, from which side-tunnels radiate leading to cells at depths of 20 to 25 cm. In sandy areas, dense...
Thanks Max, I’ll have a look at which Cerceris sp. we get here when I have time. I presumed the smaller was a Male and larger was female so I wondered whether it was attempted mating, but the weevil threw me off, and then the way it forced them into the hole/burrow.
I was on Aylesbeare RSPB reserve in Devon the other day, and witnessed a small wasp riding on the back of a larger wasp, carrying a weevil.... the smaller wasp was persistently smashing the larger wasp (with weevil) into the ground and wrestling with it, whilst another wasp was attacking...