“The judge’s task under the 1954 Act, on an application of this kind, is to assess the rent upon the basis of the rent at which the premises might reasonably be expected to be let on the open market by a willing lessor. It is to that matter that expert evidence should be directed.... As the judge rightly highlighted, it was also his task to determine that rent, having regard to the terms of the tenancy other than those relating to rent. Therefore the judge was required to assume a willing lessor of premises limited to use as an electricity substation, the term already agreed between the parties. That combination of considerations necessarily precluded a notional lessor unwilling to let the premises for such restricted use unless a premium was paid to take into account other potential uses. That is because (a) such an approach would represent a qualification on the overall notion of a willing lessor whose willingness falls to be judged on the assumption that it relates to the lease before the court; (b) because taking into account other potential uses involves ignoring what are in fact terms providing for one use and one use only.”
“I consider that the landlord in order to be willing to let the property as a whole to the hypothetical tenant would have to receive an offer approaching the sum of the values of the constituent parts, less an amount for aggravation.” (Emphasis added)