Civil Practice - Addition of parties - Claim for declaration of interest pursuant to the Property (Rights of Spouses) Act - Unmarried couple residing in a house built on land registered in the name of another -Whether any declaration may be made in respect of that property - Hearing commenced and the case of both parties closed - Application to add registered proprietor of land - Whether registered proprietor ought to be added as a defendant - Property (Rights of Spouses) Act ss. 6, 13 and 14 - Civil Procedure Rules 2002 rr 19.2 and 19.3