“53. While, however, the 1994 Deed brought about a surrender and re-grant as a matter of law, it can also be described as varying the Underlease. In fact, the 1994 Deed is called “Supplemental Deed of Variation”, explains in a recital that the parties “are desirous of altering the terms of the Lease” and provides that, save as modified, the Lease is to “continue in full force and effect in all respects”
“The undertaking to execute in the document of April 1950, was an assignment in equity, because it was conceded that it was a document for valuable consideration. That raised the short question of the construction of the option clause, and what was the meaning therein of the words "successors in title." It was an "option engrossed" as dealt with in Griffith v. Pelton,[1958] Ch. 225 , which set out the law on this subject. The obvious intention of the 1937 agreement was to give the freeholders of 75 and 76, London Road, the right to purchase the neighbouring land in order to protect the use of their windows in any subsequent sale of No. 74. The meaning of "successors in title" in the option clause was successors being owners in fee of No. 76. Accordingly, the assignment in April, 1950, was wholly inoperative because the insurance company did not own the freehold of No. 76.”
“In our judgment, having regard to the nature and purport of the option agreement and to the intimate relation between the agreement and the lease already noticed, the terms of the definition in the agreement must have been intended to limit its effect to the two parties thereto so long as they retained the quality of being respectively "lessors" and "lessees" and thereafter to those who should succeed to the reversion immediately expectant on the lease, on the one hand, and to the lease on the other. No doubt an express assignment of the benefit of the option agreement would be necessary to its effective implementation by subsequent holders of the plaintiffs' title under the lease. But it follows in our judgment inevitably from our last conclusion that, according to the true construction of the agreement, and in particular of clause 2 thereof, the option would only be exercisable by the plaintiffs or by any assignees of the benefit of the option agreement so long as the lease continued to subsist and the plaintiffs or such assignees respectively continued to have vested in them the term of the lease.”