You asked:

I would like to make a Freedom of Information Request for all statistics that you have relating to the ethnicities of people convicted of supplying different drugs in the UK. I am particularly interested in statistics relating to ethnicity and drugs supply in West Yorkshire.

We said:

Thank you for your request relating to the ethnicity of drug offenders.

We do not hold the information you have requested. Data on offenders are primarily held by the Ministry of Justice (MoJ), who may be better placed to answer your query. Their email address is statistics.enquiries@justice.gsi.gov.uk.

MoJ produce a biennial report, 'Race and the Criminal Justice System', which includes information on the ethnicity of suspects and offenders. The latest available report was published on 30 November 2017. In particular, Figure 4.09 showing the proportion of arrests for drug offences by ethnicity may be of interest to you.

We regret we are unable to assist you further. If you would like any further information, you can email CrimeStatistics@ons.gov.uk and we will endeavour to help.