@HelenCross has someone suggested Genus Ammophila for you? Their waists and abdomens appear to be more elongated than yours. I would suggest these are likely Tyde’s Sand Wasps (Podalonia tydei).
The shape of the face; the silvery-grey around the sides of the thorax (the black on the top of thorax is balding); the orange-coloured translucent wings; & the predominantly burnt-orange abdomen with black tip look very much like the Tyde’s Sand Wasp (Podalonia tydei).
