Trading losses relief

Dear Sir, I have a question related to the order in which different relifs are set against.
For example we have 3 years. 1 and 3 years are both loss-making (in terms of trading profit) and year 2 is profitable (in terms of both trading profit and other income). If I haven’t chosen any option what to do with the loss of year 1, then it is carried forward to year 2 to set against trading profit. But I also want to claim to carry back the loss of year 3 to set against general icnome of year 2. In which order will loss releifs be made in year 2? Firstly, we must deduct the carried forward loss and then carried back, right?