The RNS announcement can be found here

The results of Banco Santander for the three months ended 31 March 2024 are also released today and can be found at www.santander.com. Santander UK’s results are included within Banco Santander’s financial statements on a Banco Santander reporting basis. The results of Santander UK in the United Kingdom differ from those reported by Banco Santander, due to different accounting treatments, consolidation adjustments and the treatment of the Banco Santander London Branch. The Banco Santander London Branch is not part of Santander UK but is included in the Banco Santander results for the United Kingdom.