394. Statutory provisions as to alterations of user.

In all leases1, whether made before, on or after 1 January 1926, containing a covenant, condition or agreement against the alteration of the user of the demised premises, without licence or consent, such covenant, condition or agreement is, if the alteration does not involve any structural alteration of the premises, deemed, notwithstanding any express provision to the contrary, to be subject to a proviso that no fine or sum of money in the nature of a fine2, whether by way of an increase of rent or otherwise, shall be payable for or in respect of the licence or consent3.