"A cause of action in tort has, as its essential ingredients, a plea of duty, breach ofduty and consequent damage to the claimant. If it happens to be the case that an element of one of those essential ingredients is misstated, misdescribed or omitted, it does not mean that a correct statement, description or inclusion is a new cause of action; even if the formal result of such a statement misdescription or omission might technically be that an unaltered claim would have to be dismissed, that still does not mean that a corrective alteration involves or constitutes a new cause of action. "
'Whether one factual basis is "substantially the same" as another factual basis obviously involves a value judgment, but the relevant criteria must clearly have regard to the main purpose for which the qualification to the power to give permission to amend is introduced. That purpose is to avoid placing a defendant in the position where if the amendment is allowed he will be obliged after expiration of the limitation period to investigate facts and obtain evidence of matters which are completely outside the ambit of,' and unrelated to those *ficts which he could reasonably be assumed to have investigaiedfbr the purpose of defending the unamended claim. "53. In Lloyd's Bank plc v Rogers[1997] TLR 154 Hobhouse IJ said Q/ section 35: '