“(1) This rule applies where (a) a party applies to amend their statement of case in one of the ways mentioned in this rule; and (b) a period of limitation has expired under (i)theLimitation Act 1980 … (2) The court may allow an amendment whose effect will be to add or substitute a new claim, but only if the new claim arises out of the same facts or substantially the same facts as are already in issue on a claim in respect of which the party applying for permission has already claimed a remedy in the proceedings”