"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."
"On an application for relief from any sanction imposed for a failure to comply with any rule, practice direction or court order, the court will consider all the circumstances of the case, so as to enable it to deal justly with the application, including the need – (a) for litigation to be conducted efficiently and at proportionate cost; and (b) to enforce compliance with rules, practice directions and orders."
"The more serious or significant the breach the less likely it is that relief will be granted unless there is good reason for it."