...We view HSBC UK Bank PLC (HSBC UK) as a core subsidiary of HSBC group. HSBC UK is an important contributor to the HSBC group's financials, providing strong returns on capital and medium-term growth opportunities. The bank's common equity tier 1 (CET1) capital base as at June 2023 represented 14% of the group's and contributed 18% to the group's pretax earnings (excluding notable items) in the first half of 2023. We align our long-term issuer credit rating on HSBC UK with the 'a+' group credit profile on the HSBC group, and we do not assign a stand-alone credit profile to HSBC UK. Through internal downstreaming, we think that HSBC UK's senior creditors would benefit from the parent's additional loss-absorbing capacity (ALAC) buffer. HSBC UK operates within the U.K. ring-fencing regime. HSBC UK focuses on U.K. retail and corporate banking, and wealth management (see chart 1). Its main peers are the other large ring-fenced banks--Lloyds Bank PLC, National Westminster Bank PLC, Barclays Bank...