I can assure you that these ARE beddlington/whippet First cross, the bitch being the whippet, this is her second litter and some of the last litter where of the same markings. People on HL have seen & bought these pups with no doubt as to their parentage.
The bitch has a large white collar as you can hopefully see in the picture.
Also, to add interest about what colour /markings can be produced, I have seen a Bedlington/Greyhound that is % white!