‘When interpreting a written contract, the court is concerned to identify the intention of the parties by reference to ‘what a reasonable person having all the background knowledge which would have been available to the parties would have understood them to be using the 10 language in the contract to mean’, to quote Lord Hoffmann in Chartbrook Ltd v Persimmon Homes Ltd[2009] AC 1101 at [14]. And it does so by focussing on the meaning of the relevant words… in their documentary, factual and commercial context. That meaning has to be assessed in the light of (i) the natural and ordinary meaning of the clause, (ii) any other relevant provisions of the lease, (iii) the overall purpose of the clause and the lease, (iv) the facts and circumstances known or assumed by the parties at the time that the document was executed, and (v) commercial common sense, but (vi) disregarding subjective evidence of any party’s intentions.’
“To pay to the Lessor without any deduction a fair proportion (to be fairly determined by the Surveyor) of the expenses (including Architects’ and Surveyors’ fees) and outgoings 11 incurred by the Lessor in the repair maintenance renewal and insurance of the Building and the provision of services therein and the other heads of expenditure as the same are referred to or set out in Clause 5.3 and the Sixth Schedule hereto such additional rent (“the Service Charge”) being subject to the following terms and provisions …”