15.—(1) Where a licence to do any act which without such a licence would create a forfeiture or give a right to re-enter under a condition or power reserved in any lease is at any time on or after 1 August 1886 given to any lessee or his assigns, every such licence shall, unless otherwise expressed, extend only to the permission actually given or to any specific breach of any proviso or covenant made or to be made or to the actual assignment, under-lease, or other matter thereby specifically authorised to be done, but not so as to prevent any proceeding for any subsequent breach unless otherwise specified in the licence.
(2) All rights under covenants and powers of forfeiture and re-entry in the lease contained shall remain in full force, and shall be available as against any subsequent breach of covenant or condition, assignment, under-lease or other matter not specifically authorised or waived by the licence, in the same manner as if no such licence had been given.
(3) The condition or right of re-entry shall be and remain in all respects as if such licence had not been given, except in respect of the particular matter authorised to be done.