Where a landlord serves a section 25 notice pursuant to the Landlord and Tenant Act 1954 opposing the grant of a new lease on redevelopment ground (f), planning permission has been obtained and the landlord intends to, prior to trial, sell the premises with the permission rather than undertake the redevelopment themselves, can the successor landlord rely on the previous ground (f) section 25 notice at trial? If the original landlord does not intend to sell until after trial, can they rely on ground (f)?