Flow Data Information System

2001 Commissioned table C0711B: Migrants from outside UK by ethnic group

Table C0711 was created as commissioned output from the 2001 Census. For ease of use it has been split into three parts:

C0711B contains details of flows of migrants from outside the UK to local authorities in England and Wales. Around 45 distinct countries are recognised as origins, with other countries being merged into larger regional groups.

The output tables include 'all migrants' and 'all persons'; these are identical. They are the sum of all migrants from outside the UK, but do not include migrants with no usual address one year prior to the Census.


As noted in the commissioned output originally supplied to CIDER, a coding error caused 3191 migrants in England and Wales to be identified as 'migrants from outside the UK' even though they had migrated within the UK. Nationally, this inflates the count of migrants from outside the UK by less that 1%. The migrants are included in this data set with a 'foreign' origin of 'United Kingdom'.

Disclosure control

Data associated with destinations in England, Wales and Northern Ireland have been modified via a process known as Small Cell Adjustment Methodology (SCAM). The SCAM process is a disclosure control mechanism. For all tables process using SCAM, interior cells with a 'small' value have been adjusted. 'Small' values are understood to be in the range 0-3. Cells with an initial value of 1 have been rounded to either 0 or 3, with 0 being the more likely result. Cells with an initial value of 3 have also been rounded to either 0 or 3, but with 3 being the more likely result. Cells with initial values of either 0 or 3 have retained these values although in each case it is impossible to distinguish between rounded values and 'genuine' 0s or 3s. All sub-totals and totals have been re-calculated from the rounded cells.

There are three noticeable effects of SCAM

  1. Within-table modification. For the majority of outputs, it will be apparent that a large proportion of cells within any table are either 0 or 3, and that sub-totals and totals within the table are multiples of 3.
  2. Between-table variation. SMS Levels 1 and 2 contain several output tables, with the result that a number of values (e.g. 'total migrants') can be found in more than one table (including the commissioned tables). Due to SCAM, these values may not be consistent between tables.
  3. Between-level variation. The three spatial levels for which the SMS are available were independently subject to SCAM. Thus, if a particular value (e.g. 'total migrants') is calculated by aggregating from one spatial level to a higher one, and compared to the value found in the SMS data set for that higher level, those values are unlikely to be consistent. This also applies to data at different spatial levels for the commissioned tables.

Users are advised to ensure that data they use has been calculated by summing the minimum number of base values.

Users are advised that as an additional disclosure control mechanism, flows to the City of London have been merged into counts for flows to Westminster, and similarly flows to the Isles of Scilly have been merged into those for Penwith district.

Citation information

The following statements should be attached to all output produced using this data set

Data from this set should be cited in a bibliography as:

Office for National Statistics, 2001 Commissioned table C0711B: Migrants from outside UK by ethnic group [computer file], UK Data Service

Further information

The following pre-defined totals are available from this data set:

There are 1 tables defined for this data set:

The data are available for the following geographies:

Geographies of origin areasGeographies of destination areas
Supported directly
[i]2001 C0711 - Foreign origins[i]2001 UK districts (including NI districts)
Supported via aggregation
[i]UK Government Office Regions (1999-)
[i]2001 UK Local Authority Classification
[i]2001 ONS LAD Classification - Supergroup
[i]2001 ONS LAD Classification - Group
[i]2001 ONS LAD Classification - Subgroup
[i]2001 Vickers LAD Classification - Family
[i]2001 Vickers LAD Classification - Group
[i]2001 Vickers LAD Classification - Class
[i]2001 Vickers LAD Classification (Eng & Wales) - Family
[i]2001 Vickers LAD Classification (Eng & Wales) - Group
[i]2001 Vickers LAD Classification (Eng & Wales) - Class
[i]NUTS 2 UK Regions
[i]UK North and South Geography
[i]United Kingdom
[i]2001 CIDER Migration Classification
[i]2001 GB Districts plus Northern Ireland

Output for geographies that are only supported via aggregation will take longer than for those supported directly

Table frameworks

Table 1: Ethnic group
Total White Indian Pakistani and other South Asian Chinese Caribbean, African, Black British and other Black Mixed Other
All persons 1 2 3 4 5 6 7 8