"The Lessee will not underlet or part with or share the possession or occupation of the Premises or any part or parts thereof without the previous consent in writing of the Lessor such consent not to be unreasonably withheld or delayed."
"2.15.6 That the Lessee shall from the date hereof and throughout the term of this Lease use its best endeavours to underlet or procure the underletting of the said premises as a whole or in part or parts and will keep it so underlet both in relation to initial lettings and at rent reviews at the Open Market Rent and the Lessee will use its reasonable endeavours to recover the Open Market Rent at all times in accordance with the principles of good estate management and to the mutual interest and best commercial advantage of the parties hereto."
"You have advised us that the proposed sub-tenant will pay a rental deposit of£13,500 . Please confirm that 50% of this sum will be held by our clients."
"In principal, our client is willing to agree to a sub-letting to this company but is reasonably asking for:-
"I wondered at one stage whether the landlords were saying that they required this deposit to be held in joint names so as to secure the obligations of Straudley under the headlease, which of course was in respect of 17 units. But Mr Brook who appeared for Mount Eden disclaimed any such intention. If then it was not intended to alter the provision that if any rent was not paid to Straudley by Base International, Straudley could draw an equivalent sum from the amount in the deposit account, the effect of placing the deposit in the joint names of Mount Eden and Straudley would simply be that on any default by Base International there would be two signatures necessary - that of Mount Eden and Straudley - to a cheque drawing the equivalent sum out of the deposit account and paying it to Straudley."
"....the condition was proposed in such a way in the correspondence that it would appear, I think, to any prospective solicitor acting for Straudley that Mount Eden was attempting to improve its security position under the terms of the headlease."
"So the first reason why Mount Eden has failed to justify the condition is that the way in which it was put forward did not make it clear that Mount Eden was asking merely to be a bare trustee of the sum held in the account without any power to hinder or prevent the payment of the sum from that account to Straudley in the event of a default by Base International."
"Further or in the alternative, the Appellant was reasonable in insisting that the Respondent ensure that, one way or another, the Appellant had the benefit of half the deposit to be paid by the proposed undertenant to the Respondent."
"It gave some protection to Mount Eden: if rent was owing under the underlease from Base to Straudley, it would seem wrong that Straudley should be able to draw on the deposit for its own benefit, if at the same time it owed rent to Mount Eden under the lease."
"Section 1(3) Where there is served on the person who may consent to a proposed transaction a written application by the tenant for consent to the transaction, he owes a duty to the tenant within a reasonable time -- (a) to give consent except in a case where it is unreasonable not to give consent.
"(1) The purpose of a covenant against assignment without the consent of the landlord, such consent not to be unreasonably withheld, is to protect the lessor from having his premises used or occupied in an undesirable way, or by an undesirable tenant or assignee: per A L Smith LJ in Bates v Donaldson[1896] 2 QB 241 , 247 approved by all the members of the Court of Appeal in Houlder Bros & Co Ltd v Gibbs[1925] Ch 575 .