The amendment of a statement of case before it has been served is governed by CPR 17.1. However, any amendment made without the court’s permission can be set aside, under CPR 17.2; and it will be set aside in circumstances where, if the court’s permission had been sought, it would not have been granted. The court has power, after the expiry of the limitation period, under CPR 17.4 to: • add or substitute a new claim, but only if the new claim arises out of the same facts or substantially the same facts as a claim in respect of which the party applying for permission has already claimed a remedy in the proceedings, or • correct a mistake as to the name of a party, but only where the mistake was genuine and not one which would cause reasonable doubt as to the identity of the