Plunging into the US market has been a recipe for disaster for so many UK computer companies that no-one these days makes the move without thinking long and hard about it. The London financial systems house, Consultants (Computer & Financial) Plc took the plunge in a big way with a US acquisition a year or so ago, and reports encouraging signs of success. It says that sales for the second half of 1986 from its US subsidiary CCF Inc were in excess of $1m, and lists some blue-chip New York customers that include Chemical Bank, Manufacturers Hanover Trust, Merrill Lynch Pierce Fenner & Smith, as well as Bank of Nova Scotia and Canadian Imperial Bank of Commerce in Toronto. Key products are the Tuffs Treasury and Prism Capital Markets packages.