Fact file * In 1988, Papworth Hospital treated 4,000 patients a year and employed about 500 people. * In 2005, there are 20,000 patients annually, looked after by 1,300 employees. * The move to Addenbrooke's, backed by Cambridgeshire County Council, has been agreed in principle. * It requires the approval of the Department of Health and Monitor, the independent regulator of Foundation Trusts. * If approved in September 2006, the estimated £170million Public Finance Initiative scheme is set to be advertised across the European Union. * It is expected to take two years for tender proposals to be worked up and evaluated before a preferred bidder is identified. * Annual costs to the trust could be £17million or more, depending on what facilities are managed after the initial project is handed over. * If the go-ahead for the project is given, as envisaged, in autumn 2008, the new hospital could open in 2011/12. * The A14 improvements may not be finished until 2015.