ACCA technical article-exchange traded foreign exchange derivatives

Imagine it is 10 July. A UK company has a US$6.65m invoice to pay on 26 August. They are concerned that exchange rate fluctuations could increase the £ cost and, hence, seek to effectively fix the £ cost using exchange traded futures. The current spot rate is $/£1.71110. Research shows that £/$ futures, where the contract size is denominated in £, are available on the CME Europe exchange at the following prices: September expiry – 1.71035 December expiry – 1.70865 The contract size is £100,000 and the futures are quoted in US$ per £1. Assume Outcome on 26 August: On 26 August the following was true: Spot rate – $/£ 1.65770 September futures price – $/£1.65750 I dont understand why its gain on futures market(dollar/pound) sell – on 10 July 1.71035 Buy back – on 26 August (1.65750) if its gain ur actually selling on 10 July -$6650/1.71035= pound 3888 on 26th august $6650/1.65750= pound 4012..please correct me if m wrong.if i want o hedge against a $ payment in the future m selling today @ pound 3888 and buying them @ pound 4012. so effectively m making a loss right ?? as per their calculations gain on futures market is = .05285 (ie 1.71035-1.65750) * 39 contracts * pound 100,000 contract size =206115 dollars