Barclays Bank plc Customer Care Number is 009 44 24 7684 2100.
Headquarters: London, United Kingdom

Other contats are:

Wealth Management Customers
Premier Global Clients (BI) – +44 (0) 162 468 4444 *

Retail International Clients (BUK) – +44 (0) 162 468 4444 *

Wealth Client Services Onshore (BUK) – +44 (0) 207 761 5138 *

Wealth Client Services Offshore (BI) – +44 (0) 207 574 3008*

Blue Notch / Picture cards – +44 2476 842 099*

Business Customers
0800 151 0155*
From abroad: +44 2476 842 091*

If you want to contact Barclays Bank about a lost or stolen card, call:

Personal and Premier Customers
0800 400 100*
From abroad: +44 2476 842 099*