If better offers come along, cash savers will be allowed to open new cash ISAs. With more options, some money may be invested in fixed-rate bonds while a reserve is kept in a simple-to-access Cash ISA.
It will be possible for investors to distribute their funds across multiple suppliers. One stocks and shares ISA, for instance, might be used for longer-term investing, while another, which has cheaper dealing expenses, might be used for frequent trading.