In October 2002 the landlords gave notice that they required possession "on 4 January 2003". The tenants did not leave.
When the landlords claimed possession, the tenants defended on the basis that the notice was invalid.
Section 21(4) of the Housing Act 1988 requires that the notice shall state a date that is the last day of a period of the tenancy.
The court struck out the landlords' claim. The Court of Appeal rejected an appeal.
The last day of the period of tenancy in this case was the third of the month. The notice wrongly gave a date that was the fourth of the month. It was therefore invalid.
The landlords would have to "start again" by serving a notice giving a correct date.
Source
Housing Today
Reference
For registered social landlords managing assured shorthold tenancies, this is a salutary reminder to always use the correct date in a notice seeking possession and always add an appropriate "saving clause" to the notice in case the date used is wrong.