The 2160 clip does nothing to clarify the matter. In fact, it is blurry AF. This may be the first case where the CAM was better than the UHD version.
The only new details we got from this version is that the woman, whoever she may be, is starting to get varicose veins.
Mr. Skin says this is a body double named Katy Heffernan-Smith, but that woman seems to have a completely different body shape.