The Office for National Statistics (ONS) has begun an ambitious programme of work to transform population and migration statistics using new data- sharing powers approved by Parliament.

Working in partnership across the Government Statistical Service (GSS), the ONS is progressing a programme of work to put administrative data at the core of the evidence on international migration (UK) and population (England and Wales) by 2020.

Estimating the size of the population and how it changes is important. The ONS acknowledges that government policy makers, regional and local councils and the public, require a greater amount of detail about how different groups in the population impact on society and the economy. This includes the impact on our workforce, communities and public services such as the NHS and schools, to help people make decisions and plan accordingly, all for the public benefit.

International migration, or the numbers of people moving to and from the UK, is a key component of how our population changes over time.