Question to the Cabinet Office:

To ask His Majesty's Government what steps they are taking to improve the accuracy, consistency, and disaggregation of ethnicity data relating to Gypsy, Roma and Traveller communities across public services, following research set out in the Advicenow briefing Unpacking imperfect data: Roma overrepresentation and the need for analytical precision, published in November 2025, indicating that current data practices prevent a reliable understanding of levels of need and representation of Gypsy, Roma and Traveller children in care.

The information requested falls under the remit of the UK Statistics Authority.

Please see the letter attached from the Permanent Secretary for the Office of National Statistics.

The Rt Hon. The Baroness Whitaker

House of Lords

London

SW1A 0PW

09 March 2026

Dear Baroness Whitaker,

As Permanent Secretary of the Office for National Statistics (ONS), I am responding to your Parliamentary Question asking what steps are being taken to improve the accuracy, consistency, and disaggregation of ethnicity data relating to Gypsy, Roma and Traveller communities across public services, following research set out in the Advicenow briefing Unpacking imperfect data: Roma overrepresentation and the need for analytical precision, published in November 2025, indicating that current data practices prevent a reliable understanding of levels of need and representation of Gypsy, Roma and Traveller children in care (HL15068).

The Government Statistical Service’s (GSS) harmonisation team oversees the development and review of harmonised standards [1] for statistical data collection across the public sector. In developing harmonised standards, the GSS harmonisation team considers the data needed to inform policy, for equalities monitoring and for service delivery. This enhances the value from public sector data collections by improving the comparability and coherence of statistics across sources. We acknowledge the difficulty in data collection and disaggregation for some populations, particularly where sample sizes are small.

The current ethnicity harmonised standard [2] is based on the 2011 Census questions across the UK. The questions were reviewed and adjusted so they could be used in the 2021 Census for England and Wales, the 2021 Census for Northern Ireland, and the 2022 Census for Scotland. In these censuses, the category “Gypsy or Irish Traveller” was included as a tick box in England, Wales, and Scotland. In Northern Ireland, this category was tailored specifically to “Irish Traveller”. As part of the 2021 census updates, “Roma” was included as a separate tick box option in all nations.

The GSS is currently reviewing the harmonised standard on ethnicity, with the intention to encourage consistent and inclusive data collection across the Government Statistical Service. As part of the review, the team recently ran a public consultation [3] to gather evidence of user, community, and respondent need for additional tick boxes in the new ethnicity harmonised standard; ethnic groups represented in existing response options, as described above, will be retained.

The proposed new ethnicity harmonised standard for online data collection will be published by the end of 2026. We have published wider detail on the programme of work online [4]. We are working closely with departments and organisations across government to encourage adoption of the harmonised standard and support its effective implementation.

While we encourage data collectors in the GSS to align to harmonised standards, they are not compelled to do so. Some non-statistical data collectors in the public sector and beyond also align, though due to operational constraints sometimes this alignment is not always to the latest standard. Meanwhile, the GSS recognises that some data collectors choose not to align because their needs for data differ. This is why the options for responding to ethnicity questions vary across different data collectors.

Additionally, a team within the UK Statistics Authority is conducting qualitative research with Roma communities in England and Wales, due to be published later this year. The findings will support a more nuanced understanding of their lived experience and specific needs, as well as providing insights to inform statistical producers in considering how Roma identity is represented and captured in data in the future.

Yours sincerely,

Darren Tierney

[1] https://analysisfunction.civilservice.gov.uk/government-statistical-service-and-statistician-group/user-f

[2] https://analysisfunction.civilservice.gov.uk/policy-store/ethnicity-harmonised-standard/

[3] https://consultations.ons.gov.uk/harmonisation/gss-ethnicity-harmonisation-consultation/

[4] https://analysisfunction.civilservice.gov.uk/policy-store/review-of-the-ethnicity-harmonised-standard-overview-of-our-redesign-research-to-date/