Your question raises the security of tenure enjoyed by tenants of commercial premises. Although the common law provides for the termination of their leases, statute gives a degree of security of tenure both before and after the final day of the contractual term. When a tenant occupies premises for the purposes of a business, unless the parties contract out of it, the lease has the protection of Part II of the Landlord and Tenant Act 1954 (LTA 1954). LTA 1954, s 24 provides that when the contractual term comes to an end, the lease is continued until brought to an end in accordance with the provisions of the Act. Usually, either the landlord will serve a notice under LTA 1954, s 25 or the tenant will serve one under LTA 1954, s 26. As your question is not concerned with the mechanics