By Jennifer Sieg Spire Healthcare has reported a jump in revenue as the healthcare provider once again benefited from a high-performing private sector and a surge in medical insurance amongst working-age people. In its half-year resultstoday, the FTSE 250-listed company, which is also the UK’s second-largest private healthcare group, said revenue was up 12.7 per cent to £762.5m. Adjusted earnings before interest, taxes, depreciation, and amortisation (EBITDA) was up 10.8 per cent to £130.6m. Adjusted profit before taxation also increased, up by 20.2 per cent to £26.8m. Justin Ash, chief execut…