Residential Tenancies Act 2004
Purposes of Chapter.
43.—This Chapter has effect for the purpose of ensuring that the additional rights provided by Chapter 4 are regarded as being of a rolling nature, that is to say, that (unless the landlord uses the means under this Part to stop the following happening)—
( a) on the expiry of a further Part 4 tenancy, after it has been in existence for F88 [ 6 years ], another such tenancy comes into being, and
( b) on the expiry of that tenancy, after it has been in existence for F88 [ 6 years ], a further such tenancy comes into being,
and so on.