Question to the Department of Health and Social Care:

To ask the Secretary of State for Health and Social Care, what assessment he has made of the potential impact of the absence of outcome data on the cohort of young people treated by the Gender Identity Development Service during the period in which referral patterns and clinical presentations changed significantly on (a) patient safety and (b) public confidence.

The Government and NHS England have made a clear commitment to implement all the recommendations in the Cass Review’s final report, and this includes the data linkage study.

The data linkage study remains an important commitment within the wider national research programme underpinning the design and delivery of the new model of National Health Service care in place in England for children and young people with gender incongruence / dysphoria. The study is observational in nature, linking and analysing existing, routinely collected healthcare data for adults who, as children, were referred into the former Gender Identity Development Service, previously operated by the Tavistock and Portman NHS Foundation Trust.

The data linkage study design will enable consideration of any associations observed within currently available data, rather than providing direct evidence on the cause and effect of any individual treatment approach. Nonetheless the study aims to provide valuable additional insights into the characteristics, healthcare experience and intermediate outcomes of this previous cohort of children and young people accessing NHS gender care, and to inform future gender care.

The Department has continued to regularly engage with and support NHS England, which has taken on responsibility for study delivery. Since taking over responsibility for delivering the data linkage study, NHS England has taken time to undertake further due diligence on the data sources that will underpin the study, and to re-engage with data-sharing organisations, on which the study will be dependent. This has led to small but important proposed improvements in study design, subject to the approval of the Health Research Authority (HRA), that both respond positively to stakeholder feedback and that will better facilitate the collaboration of study data sharing partners. This will include carefully monitoring and considering whether any further steps may be required to ensure timely progress on data collaboration.

These improvements also include a more appropriately confined data ask of adult gender clinics, planned phasing so that initial linkages can be completed against national data sets already available to NHS England, before additional adult clinic data becomes available from study partners, and the option for individuals in the study cohort to register via a single, more simply accessed study specific data opt-out which can remain open up until just before the study analysis is finalised.

Important final steps are currently being taken to enable the study to begin. On 26 February, an updated order was laid in both Houses of Parliament to facilitate delivery of the data linkage study. The order will provide appropriate legal protections for those individuals and organisations who will be sharing or processing data potentially subject to the specific protections of the Gender Recognition Act 2004, for the purpose of the study. The order is expected to come in to force on 20 March 2026. Final HRA study approval will also need to be in place before the study can begin.