The Government Says

Department for Business and Trade (DBT) prompt payment data January to March 2026

Department for Business and Trade (DBT) prompt payment data January to March 2026
Local copy of dbt-prompt-payment-data-january-march-2026.csv

https://www.gov.uk/government/publications/department-for-business-and-trade-dbt-prompt-payment-data-january-to-march-2026

seen at 14:45, 21 May in Transparency and freedom of information releases.