He can apply to have the ccj set aside. His local County Court should be able to give him the form and advise him on how to go about it. However, he will have to give sufficient information to convince a judge that - had that information been available when the original decision was made - the outcome would have been different. Also, if he received the Court papers when the creditor issued the claim that led to the ccj, he will have to explain why he did not put in his defence at that stage.
If he does get the ccj set aside then he will have to take some other action to get the charging order removed.