Cumulative severity in project licences: response from Lord Hanson (accessible)
Published 28 October 2025
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Lord Hanson of Flint
Minister of State
2 Marsham Street
London
SW1P 4DF
By email: asc.secretariat@homeoffice.gov.uk
DECS Reference: MIN/1393990/25
1 October 2025
Dear Sally,
Thank you for your letter of 18 August on the issue of cumulative severity in project licences authorising the use of non-human primates (NHPs) in severe procedures.
I am very grateful to the Animals in Science Committee for its continued diligence and thoughtful oversight in this policy area, one of significant societal interest.
I accept the Committee’s recommendation that the Animals in Science Regulation Unit
(ASRU) undertakes a themed audit to quality assure the process by which project licence holders determine actual severity assessments, and how cumulative severity is considered in such licences. I agree that a deeper understanding of retrospective assessment processes, and assurance of their effectiveness, would provide a foundation for improved guidance and aid in sharing best practice.
I am committed to supporting continued improvements in the regulation of animal research, and I will ensure that your recommendation is given due consideration. I
recognise that ASRU is concluding a regulatory reform programme and therefore expect the commencement of the audits, to be determined by the Head of the Regulator, will be in 2026. I have asked my officials to discuss this matter with you further and provide feedback on the implementation of the advice.
Thank you again for your letter.
Yours sincerely,
Lord Hanson of Flint