...We view HSBC UK Bank PLC (HSBC UK) as a core subsidiary of the HSBC group. HSBC UK is an important contributor to HSBC group's financials and offers reasonable growth opportunities to the parent. The bank's Common Equity Tier 1 (CET1) capital base as at year-end 2021 represented 13% of the group's, and it contributed 24% of the group's 2021 adjusted pretax earnings. 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 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 UK PLC, and Santander UK PLC--as well as Nationwide Building...