New research from online stockbroker and fund supermarket Interactive Investor (www.iii.co.uk) reveals that investors are increasingly looking for ways to boost their income and many are choosing the route of self-select ISAs. According to the survey, the number of people only taking out a self select ISA has gone up by over half so far this tax year, to almost one in three (31%) of all investors, with a further 44% investing in funds ISAs or a mix (Cash and Self-Select). In addition, the number of people only taking out a cash ISA this year has dropped from 37% to 25%.