In UK they were the four main banks -

Barclays

Midland

Lloyds

National Westminster

The four largest banks in the UK are HSBC, Barclays, RBS, and Lloyds TSB. The Big Four as they are known were the topic of discussion in late 2012 for being bailed out.

Most of the major Australian banks do offer credit cards. Some of the banks that do offer them include the "big four" banks of ANZ, Westpac, Major St. George and NAB.

Bank of America, Citibank, Chase, Wells Fargo, US Bank, That's 5 pretty big ones.

Classification of Banks in India is done into four main classes. The classes include commercial banks, savings banks, public sector banks and private sector banks.