"If the landlords unreasonably withhold their consent, then there is no covenant on the part of the lessees at all relating to the subject-matter, because the words 'such consent not to be unreasonably withheld' import a condition into the covenant so that the covenant is conditional upon the consent not being unreasonably withheld; the result being that, when a licence or consent is unreasonably withheld, there is no covenant on the part of the lessee at all, the condition not having been fulfilled."
"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 reasonable not to give consent, (b) to serve on the tenant written notice of his decision whether or not to give consent specifying in addition - (i) if the consent is given subject to conditions, the conditions, (ii) if the consent is withheld, the reasons for withholding it."
"Giving consent subject to any condition that is not a reasonable condition does not satisfy the duty under subsection (3)(a) above."
"It is for the person who owed any duty under subsection 3 above - (a) if he gave consent and the question arises whether he gave it within a reasonable time, to show that he did, (b) if he gave consent subject to any condition and the question arises whether the condition was a reasonable condition, to show that it was, (c) if he did not give consent and the question arises whether it was reasonable for him not to do so, to show that it was reasonable, and, if the question arises whether he served notice under that subsection within a reasonable time, to show that he did."
"an application or notice is to be treated as served for the purposes of this Act if – (a) served in any manner provided in the tenancy, and (b) in respect of any matter for which the tenancy makes no provision, served in any manner provided bysection 23 of the Landlord and Tenant Act 1927 ."
"It may be that the reasonable time referred to in section 1(3) will sometimes have to be measured in weeks rather than days; but even in complicated cases, it should in my view be measured in weeks rather than months."