Between 1990 and 1999 deaths amenable to medical care had been falling more slowly in England and Wales than in Scotland and Northern Ireland. However the rate of decline in England and Wales increased after 1999 when funding of the NHS there increased. Examination of individual causes of death reveals a complex picture, with some improvements, such as in breast cancer deaths, occurring simultaneously across the UK, reflecting changes in diagnosis and treatment that took place in each nation at the same time, while others varied.Measuring NHS performance 1990–2009 using amenable mortality: interpret with care