Conveyancing and Law of Property Act 1892 (-)
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This document is for private study purposes only. It is likely not to reflect the law as it stands today. It may be incomplete, and some provisions are likely to have been repealed or amended, and new ones inserted.

3.-- In all leases containing a covenant . . . against . . . underletting . . . the land or property leased without licence or consent, such covenant . . . shall, unless the lease contains an expressed provision to the contrary, be deemed to be subject to a proviso to the effect that no fine or sum of money in the nature of a fine shall be payable for or in respect of such licence or consent . . .

05 June 2014
http://www.swarb.co.uk/acts/1892Conveyancing_and_Law_of_PropertyAct.html ver 17 Dec 2012