You asked

I would like to formally request detail of the number of reports or complaints from ONS staff made on the grounds of racism.

We said

Thank you for your email.

We take any accusation of racism seriously and investigates all complaints of any nature fully.

Since April 2018 (this is a date at which we introduced a tracking system allowing us to record all employment relations cases supported centrally by the Complex Casework team) we have received 5 complaints from staff related to race, addressed under the relevant ONS policy and procedures.