Quilter, with 7.6 billion pounds under management, takes private clients prepared to invest at least 25,000 pounds, while international private banking businesses such as Morgan Stanley's typically cater to clients worth millions.
Morgan Stanley first sold Quilter to rival Citi
U.S. banking groups like Morgan Stanley operate private banks in Europe that concentrate on the super rich, while running wealth management brokerage businesses in their home market for the so-called mass affluent.
Quilter, Morgan Stanley and Bridgepoint all declined to comment.
(Reporting by Chris Vellacott and Simon Meads; Editing by Helen Massy-Beresford)