during and for as long as the Lessee shall after the Event occupy and continue to occupy the Leased Property or any part thereof by itself or its agents, servants, contractors or subcontractors or any other permitted persons for purposes of or in connection with any of the decontamination and reinstatement works, the Lessee shall be and shall be deemed to be the occupier of the Leased Property and every part thereof for purposes of liabilities arising or which may arise under or by virtue of occupiers' liability and the Lessee shall indemnify the Lessor in relation to all such liabilities and any other loss or damages suffered by the Lessor as a result of the Lessee's acts, omissions or use or occupation of the Leased Property