"Commission on major contracts may be considered in the following manner:
"29. Our conclusion is that Mr Brook [who was the relevant manager] did not exercise the respondent's discretion in accordance with the contract term. Instead, he chose an arbitrary figure of£5,000 in respect of each quarter. It is arbitrary because Mr Brook has not demonstrated its relationship to a comparison of profitability on the approved cost model and on the subsequent audit. Further, if he was exercising a discretion, he was bound to make some adjustment to the December payment once the respondent conceded that a sum as large as£55,440 should be removed from the costs column ..."
" ...Whilst we do not doubt that Mr Brook had the audit result when he decided to cap the applicant's commission payments, we infer from his refusal to adjust the payment for the December quarter and the real importance attached by the respondent to this contract, that its performance was, if anything, a secondary consideration in Mr Brook's mind. His primary consideration was the potential size of the applicant's earnings and a desire to reduce those earnings to what senior management saw as an appropriate level."