‘(1) This rule applies where a party is to be added or substituted except where the case falls within r.19.5 (special provisions about changing parties after the end of a relevant limitation period). (2) The court may order a person to be added as a new party if – (a) it is desirable to add the new party so that the court can resolve all the matters in dispute in the proceedings; or (b) ... (3) The court may order that any person cease to be a party if it is not desirable for that person to be a party to the proceedings. (4) The court may order a new party to be substituted for an existing one if – (a) the existing party’s interest or liability has passed to the new party; and (b) it is desirable to substitute the new party so that the court can resolve the matters in dispute between the proceedings.’
‘(1) The person who made the mistake must be the person responsible, directly or through an agent, for the issue of the claim form; (2) it must be shown that, had the mistake not been made, the new party would have been named; and (3) the mistake must be as to the name of the party.’ 99. ’35. There is a footnote which should be added to the Adelson case. In holding that the Sardinia Sulcis test still applies, the Court of Appeal cannot have intended to suggest that it remains necessary to show that the mistake was not misleading or such as to cause any reasonable doubt as to the identity of the person intended to be sued. As already mentioned, and as was noted in the Adelson case at para 44, that was a requirement of the old RSC Order 20 r.5 but it is not a requirement ofCPR r.19.5 (3). To that extent at least, the law has been liberalised. 36. This is confirmed by the decision of the Court of Appeal in Horne-Roberts v SmithKline Beecham plc[2002] 1 WLR 1662 . In that case the Claimant initially sued Merck believing it tobe manufacturer of a vaccine which the claimant had received and which he claimed had caused him personal injury. In fact, the vaccine had been manufactured by SmithKline. After the expiry of the limitation period Bell J granted an application to substitute SmithKline as the defendant. The order was upheld by the Court of Appeal. Keene LJ said at para 45 that “the claimant always intended to sue the manufacturer of the identified vaccine and that is sufficient to give the court the power to substitute the true manufacturer”. 37. It could not be said, and was not suggested in the SmithKline case, that the claimant’s mistake in naming Merck as the defendant instead of SmithKline was not misleading or such as to cause doubt as to the identity of the party to be sued. It obviously was. Indeed, SmithKline did not even become aware of the claim until after the limitation period had expired. Nevertheless, as was noted in the Adelson case[2008] 1 WLR 585 , para 57, the Court of Appeal still held in the SmithKline case that the Sardinia Sulcis test could be, and was, satisfied. It cannot therefore be an element of the test, at any rate as it now applies, that the mistake was not misleading or such as to cause reasonable doubt as to the identity of the person intending to sue or intended to be sued.’