Just a bit of C+P, but I think you'd have trouble arguing these were marginal benefits:
Worldwide family travel insurance
Independent Financial Advice
Inheritance Tax Planning
Relationship Manager
Global Concierge Services
Premier Bank Account * £500 interest free overdraft with an automatic £5,000 limit, typical EAR 9.9% variable. * No fees for overdrawing your account or exceeding an agreed limit. * Withdrawals of up to £2,000 can be made against cheques paid in, before they have cleared (available at HSBC Bank only). * Access to cash worldwide using Cirrus/Maestro cash machines free of any fees from HSBC when using your Premier International Debit Card*.
Preferential fixed rate mortgages (and variable rate mortgages over £250,000)
Savings - HSBC Premier Savings and Preferential Cash Mini ISA, each giving 0.4% extra as a starting point.
HSBC Premier Credit Card - 9.9% TAPR and 2 years extended manufacturers' warranty
International personal banking - if you require accounts overseas
Identity theft assistance and Personal security advice at home and abroad
Global Emergency Services - help in a medical, financial or legal emergency worldwide. * Emergency cash at 170,000 locations. * Emergency medical referral and where necessary to an English speaking doctor. * Emergency legal referral to lawyers and other legal service providers. * Expert help with lost travel documents, luggage or cards. * Emergency messaging, medical evacuation and repatriation.