It was acquired by National Provincial Bank in 1961, becoming part of the National Westminster Bank upon the merger of its parent with Westminster Bank in 1968 and joined The Royal Bank of Scotland Group in 2000 when the National Westminster was purchased by the Scottish bank.
In 1920 the Westminster Bank appointed Jetha Lila its agent to represent its interests in Zanzibar.
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Other business positions held by Dent included chairmanship of the Caledonian (Ceylon) Tea Estates and the Shanghai Electric Construction Company and directorships of the Chartered Bank of India, Australia and China, the London County and Westminster Bank and the Royal Exchange Assurance Corporation.
The former National Westminster Bank in Spring Gardens, Manchester, England, is an Edwardian bank building constructed in 1902 for Parr's Bank by Charles Heathcote.
In 1989, International Westminster Bank Ltd was merged with National Westminster Bank PLC by a Private Act of Parliament.