16 That situation does not provide any great assistance to the present case. Cases in this field do, however, indicate that where increased overheads are to be taken into account in favour of a contractor, it is necessary for the contractor to be able to show that it has suffered loss by reason of being unable to deploy those overheads elsewhere to produce income. Similarly, in the present kind of situation, the contractor is not entitled to the benefit of a presumption that no proportion of its fixed overheads were necessary to be incurred in earning the contract sum unless it puts on evidence showing that to be the case.
17 There have not been many authorities in Australia relating to the question of whether a proportion of fixed overheads is to be brought into account as against a contractor's claim for revenue foregone by reason of the principal's breach of contract, although there have been authorities relating to the reverse position where a contractor is claiming in respect of overheads [See, e.g., Hughes Bros Pty Ltd v The Trustees of the Roman Catholic Church for the Archdiocese of Sydney (unreported, 16 October 1997, Supreme Court of NSW (Giles CJ Comm D)); Bulk Materials (Coal Handling) Pty Ltd v Compressed Air & Packaging Systems (NSW) Pty Ltd (unreported, 17 July 1997, Supreme Court of NSW (Giles CJ Comm D)); GEC Marconi Systems Pty Ltd v BHP Information Technology Pty Ltd [2003] FCA 50].
18 However, clear guidance is provided in the joint judgment of the High Court in TC Industrial Plant Pty Ltd v Robert's Queensland Pty Ltd [(1963) 180 CLR 130], where, in rejecting the proposition that there had to be an election between loss of profits and wasted expenditure [see pp.138-143], the English case of Cullinane v British "Rema" Manufacturing Ltd was analysed at some length [at p.139.7]. It was observed in the course of that consideration that loss of profit was derived by subtracting from estimated receipts running costs, office expenses, interest and depreciation. The High Court also observed (at p. 140.2] that it would not have been right to award loss of profits without deducting depreciation as well as capital expenses, because that would entail awarding full profit without the expense of earning it [See also Cheshire & Fifoot 9th Australian Edition p [1081]-[1082]; Gates v City Mutual Life Assurance Society Ltd (1986) 160 CLR 1 at [11]-[12]]. That decision should govern the outcome in this case. In remitting the matter, the High Court [at p.143] said: