Sorry, I should have made this clear in a previous post, the student did telephone the home field after arriving at the other airfield and was advised to wait half an hour or so and if the weather didn't clear at the fogged in field then to return to base.
A similar situation to this arose a few months back at another school and a telephone call and letter to the CAA got a written reply that the cross country was valid (even though the 2 land away's were not completed on the same day!)
Seems that the CAA probably examine each case individually instead of just having a strict policy on it?!
That said, for a certain pass, the student is attempting it again.
Best regards
Jimmydacraw