High Quality Content by WIKIPEDIA articles! National Westminster Bank Plc, commonly known as NatWest, is the largest retail and commercial bank in the United Kingdom and has been part of The Royal Bank of Scotland Group Plc since 2000. The Royal Bank of Scotland Group (RBS) is ranked as the second largest bank in the world by assets. It was established in 1968 by the merger of National Provincial Bank (established 1833 as National Provincial Bank of England) and Westminster Bank (established 1834 as London County and Westminster Bank). Traditionally considered one of the Big Four clearing banks, NatWest has a large network of 1,600 branches and 3,400 cash machines across Great Britain and offers 24-hour Actionline telephone and online banking services. Today it has more than 7.5 million personal customers and 850,000 small business accounts. In Northern Ireland it operates through its Ulster Bank subsidiary.