Leech J in Various Claimants v Barclays Bank PLC

In group/multi-party securities litigation, permission to amend the claim form and particulars to correct claimant names and to add or substitute parties is governed by CPR 17.4 / 19.6 and the court's discretion, requiring the applicant to satisfy the conditions for amendment after the limitation period (e.g. same or substantially the same facts, or a genuine mistake as to the proper party).