Where an application for variation or correction of a judgment is brought, proper service on all interested parties is required by the rules. Service effected at a former address where process is left on a gate after refusal of acceptance does not constitute proper service. Where there is a question as to whether an amendment to correct a citation error amounts to substitution of a party in a finalized matter, and such substitution could potentially cause prejudice that cannot be cured by costs, the matter should be re-opened to allow all interested parties to be heard in the interests of justice. A Ministry is not a legal entity with capacity to be sued; rather it is the Minister who is the legal head with capacity to sue and be sued on matters affecting a Ministry.