“…Such changes are also occurring in healthcare systems throughout the world (Ross 1999, Chang & Wong 2001, Nkowane & Saxena 2004, Schober & Affara 2006. The global ageing population, worldwide shortages of staff, the increase in chronic disease, the growth of day surgery, the expansion of primary care and the continued reduction on the length of hospital stay all contribute to changing patterns of health care need and demand (Read et al 2001, Jenkins-Clarke & Carr-Hill 2003. In the UK, the development of these roles has been influenced by a number of other background factors.…”