How do i contact sainsburys head office? Head office. Sainsbury's Store Support Centre 33 Holborn London EC1N 2HT. Switchboard 020 7695 6000. Registered number: 185647. Contact Sainsbury's. Contact Sainsbury’s BankWhere is sainsburys bank located? Sainsbury's Bank headquarters is located at 33 Holborn, London. Where are Sainsbury's Bank offices? Sainsbury's Bank has offices in London and Edinburgh.Is sainsburys bank regulated in the uk? Sainsbury's Bank plc, Registered Office, 33 Holborn, London EC1N 2HT (registered in England and Wales, no. 3279730) is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority (Register no. 184514).How do i contact sainsburys bank in holborn? 33 Holborn. London. EC1N 2HT. Switchboard. 020 7695 6000. Registered number: 185647. Contact Sainsbury's. Contact Sainsbury’s Bank. View in Google maps.