Migration describes the movement of people in or out of an area. Measuring migration is useful in estimating the change in population over time and is one of the factors considered by the Office of National Statistics in deriving population estimates in the years following a national census.
There are two broad types of migration. The first, which is called international migration, looks at the number of people moving into an area from overseas and out of an area to overseas. The second form of migration, which is called internal migration, looks at the number of people who move from one part to another part of the UK.
The total movement of people, both in and out of an area, is known as population turnover. The international population turnover rate for Slough (that is the total number of people coming to Slough from overseas, as well as those moving to live abroad), though still higher than the England average, is coming down and is much lower than it was in 2011 (Figure 1).
While turnover rate illustrates the total amount of movement in and out of the area, Net migration measures whether the balance of movement is towards those moving into the area or those moving away. That is, it is the number moving in minus the number moving out.
According to Office of National Statistics (ONS) projections for 2015, the net international migration figure is around + 1,000 per year and the net internal migration figure is around -1,000 per year, therefore it is predicted that there is overall balance in migration.
The national Census provides more details on people who come to live in an area who are originally from another country. Slough’s 2011 census figures show that 61% of people living in the Borough were born in the UK, 10% were born in another European Union country and 29% were born elsewhere.
The most common ages for people to arrive in the UK for people living in Slough are 0 to 4 years and 20 to 44 years, which suggests that these are families with young children. This is shown in Figure 3.
Source: Office for National Statistics.
The majority of people living in Slough who were not born in the UK have been living in the UK for 10 years or more.
Around 67% of households in Slough have all members of that household with English as their first language. This is a lower proportion than the national and South East regional averages. Over 15% of households in Slough have no-one living in them who have English as their first language, which is a much higher proportion than the national and regional averages.
As well as looking at usual UK residents, the annual Census also provides information about short-term residents. These are residents who were not born in the UK and who intend to stay in the UK between three and twelve months. There are proportionally more short-term residents in Slough that come from Middle East and Asia than there are nationally or in the South East region as a whole. There are proportionally fewer short term residents from any other part of the world.
That population information, including migration, is used to inform future planning.
More detailed analysis on the 2011 Census can be found at: