Forty-one per cent of people investing through an adviser are unaware of impact of so-called platform fees. : Forty-one per cent of people investing through an adviser are unaware of impact of so-called platform fees If you invest your savings through a financial adviser, you may be one of many individual investors unwittingly spending thousands of pounds on a little-known type of fees. New research seen by the Independent shows that 41 per cent of investors are unaware of the impact of platform fees on their investments.