[F21A. A tenancy is not a secure tenancy if it is an introductory tenancy or a tenancy which has ceased to be an introductory tenancy—N.I.
(a)by virtue of Article 15(3) of the Housing (Northern Ireland) Order 2003 (disposal on death to non-qualifying person), or
(b)by virtue of the tenant, or in the case of a joint tenancy every tenant, ceasing to occupy the dwelling-house as his only or principal home.]]