You asked
I am interested in obtaining an ethnicity and country of origin breakdown of the UK Prison population for the years 2008 and 2014.
We said
Thank you for your request. I can confirm that this information is not held by the Office for National Statistics. The Ministry of Justice are responsible for producing prison statistics: https://www.gov.uk/government/collections/prison-population-statistics
The general contact email address is: statistics.enquiries@justice.gsi.gov.uk