Costs awarded on ‘party and party’ basis against unsuccessful lay litigant on failed application to substitute plaintiff in proceedings

Costs - unsuccessful application by non-party to be substituted as plaintiff in proceedings - purported assignment of proceedings from corporate plaintiff to its sole shareholder - order for costs already made against unsuccessful applicant in High Court in other proceedings arising from a findings of an abuse of the court's process - submissions - costs to follow event - solicitor and client basis - whether applicant on notice of other judgment to the effect that he knew he was not entitled to make the application in these proceedings - whether costs should be awarded 'in the cause' - Order 99 RSC - ordinary rule as to costs - rationale underlying rule - Order 99 rule 1(4A) - justly adjudicate - principles governing costs application - personal costs exposure cannot be transferred to corporate plaintiff - defendant entitled to costs - principles governing making of an order on 'solicitor and client' basis - compass of principal judgment narrow - level of unreasonableness or moral culpability does not warrant making of such an order - costs ordered against applicant on party and party basis with stay in the event of an appeal