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I know nothing about Delia albata, except that it has been found along the Channel (Zuydcoote). The genus Delia was just proposed as a possibility on the french forum.

Here are two other pictures if they can help:
the last sternites:

H. Dumas : France : La Ciotat : 13600 : 30/09/2024
Altitude : NR - Taille : --
Réf. : 351846

the left hind tibia (front view):

H. Dumas : France : La Ciotat : 13600 : 30/09/2024
Altitude : NR - Taille : --
Réf. : 351845