By Guy Taylor Rolls-Royce has held full-year guidance as the engineering giant continued to benefit from soaring demand for its aircraft engines and increased defence spending. In a trading update published this morning, the FTSE 100 firm said it expected underlying operating profit of between £2.1bn to £2.3bn in the current year and free cash flow of £2.1bn to £2.2bn, unchanged from a prior forecast in August. It flagged continuing strong demand in Civil Aerospace, where large engine flying hours grew by 18 per cent year-on-year to 102 per cent, surpassing the levels seen before the pandemic …