"22. Both the applicant and Mr Mead put before us the report of the cases of Selkent Bus Company Limited v Moore[1996] IRLR 661 in which the principles applying to consideration of an application to amend are set out. We have read that report and reminded ourselves of the principles. In our view this is clearly not a minor correction of clerical or typing errors. In many ways, however this proposed amendment is in our view an addition of factual details to existing allegations and it is also an addition or substitution of other labels for facts already pleaded. We have to decide whether it is a new cause of action. We conclude that in essence it is not. It is true that the original pleading did not make the second to the sixth respondents alleged liability clear but at all times the applicant has said that those various parties had made rules, policies and decisions which impacted through other persons' decisions on him."
"(i) amendments to the Originating Application which are merely designed to alter the basis of an existing claim, but without purporting to raise a new distinct head of claim (ii) amendments which add or substitute a new cause of action but one which is linked to, or arises out of the same facts as, the original claim, and (iii) amendments which add or substitute a wholly new claim or causes of action which is not connected to the original claim at all."