Well, I’m not sure about that. If variations can be proven to exist, a sensible employer should want to logically apply them in a hiring decision. Indeed, some major, well known employers have scrapped the 2:1 requirement, preferring to assess overall academic achievement and performance in interviews. They’re also accepting the fact that a 2:2 from somewhere like Oxford is just as hard, if not harder to get, than a 2:1 from many places.