This will depend on whether or not the substation lease excluded the Landlord and Tenant Act 1954 (LTA 1954), as substation leases do appear to fall within the security of tenure provisions, as set out in Practice Note: Substation leases—key issues for landowners and utility companies (see EDF Energy Networks (EPN) plc v BOH Ltd). Substation lease is LTA 1954 protected In this scenario, A will still have protection under LTA 1954 as it remains in occupation (subject to the part of the premises occupied by the substation lease), for business purposes. However, Y will have, upon service of LTA 1954, s 25 notice on A (or LTA 1954, s 26 request), also