Yep Google is your friend:
"A Section 25 notice is a formal legal document used by a landlord to either terminate a commercial lease (with security of tenure) or propose a new lease with different terms. It's named after Section 25 of the Landlord and Tenant Act 1954, which outlines the information a landlord must provide to a tenant when ending a business tenancy. There are two main types: a "friendly" notice suggesting new terms, and a "hostile" notice opposing renewal"