A Commonwealth-born veteran, who served for more than a decade in the British army including tours of Afghanistan and Iraq, has been told he must pay more than £27,000 for NHS hospital bills after an emergency operation to remove a brain tumour.Hospital staff have classified Taitusi Ratucaucau, 49, as an overseas patient, and therefore ineligible for free NHS care. He joined the British army in 2001 and has been continuously in the UK since being discharged from the military in 2011, living here with his wife and three daughters, and paying tax and national insurance.