“If a witness statement or a witness summary for use at trial is not served in respect of an intended witness within the time specified by the court, then the witness may not be called to give oral evidence unless the court gives permission.”
“Where a party has failed to comply with a rule, practice direction or court order, any sanction for failure to comply imposed by the rule, practice direction or court order has effect unless the party in default applies for and obtains relief from the sanction. (Rule 3.9 sets out the circumstances which the court may consider on an application to grant relief from a sanction.)”