There are two mechanisms under legislation that allow landlords to evict their tenants. Under s21 of the Housing Act 1988 (recovery of possession on expiry of assured shorthold tenancy) there is ‘no fault’ on the part of the landlord and the tenant doesn’t have to have breached their tenancy agreement. This is known as ‘accelerated possession’.
The Deregulation Act 2015 means that there are 2 different regimes in operation for the serving of s21 notices under an Assured Shorthold Tenancy. Which one is actually used depends on whether the AST commenced before or after the 1st October 2015. More on these regimes can be read here.
The other method of eviction comes under s8 of the Housing Act 1988 (notice of proceedings for possession) and Schedule 2 which provides 20 grounds for landlords to evict where the tenant has committed a breach of the tenancy agreement.