National Westminster Bank (National Westminster Bank; abbreviated: NatWest Group) is the world's premier banking group, formed by the merger of three prominent British banks on March 18, 1968, under the umbrella of the National Westminster Bank Group. The banking group focuses on retail and commercial banking, asset management, global financial markets, global debt markets and advisory.

Standard Chartered Bank is a market leader in Asia, Africa and the Middle East through organic growth and mergers and acquisitions, listed on both the London and Hong Kong stock exchanges and ranked in the top 25 companies (by market capitalisation) in the FTSE 100 (London Financial Times 100 Index). (based on market capitalization).

Northern Rock (Northam Rock) is a British bank founded in 1965, headquartered in Newcastle, and the fifth largest mortgage lender in the UK, acquired by Virgin Finance in 2011. It was acquired by Virgin Finance in 2011;

Lloyds Banking Group plc (Lloyds Banking Group) was established in 2009 following the acquisition of HBOS by Lloyds TSB Bank, which is majority owned by the UK government and headquartered in London, UK. Lloyds Banking Group subsidiaries include Lloyds TSB Bank, Bank of Scotland, etc. The main business includes retail banking, private banking, life insurance, etc. In 2013, Lloyds Banking Group was ranked 85th in the World Top 500.

The Co-operative Bank is the UK's largest consumer co-operative bank, specialising in a range of financial products including current accounts, savings accounts, credit cards and loans.

The Clydesdale Bank of Scotland was a Scottish commercial bank, the smallest of the three in Scotland until its establishment in Glasgow in 1838. It was independently owned and operated until 1920 when it was acquired by Associated Bank, then in 1987 it was sold to its current owner, the National Australia Bank. In 1863, Clydesdale Bank was more successful in acquiring the Bank of Eastern Scotland, whose head office is in Dundee, and which has two separate offices, one in Dundee and the other in Edinburgh.