By Elliot Gulliver-Needham Investors who want to know how a St James’s Place fund compares to any other vehicle in the market have a problem: they just can’t do that. Traditionally, funds can be compared by taking into account the performance of their assets, minus the fees on the fund, and comparing that with other funds in their sector. However, St James’s Place’s fees are expressed as an all-inclusive charge that combines the advice, product or platform, and fund charge. According to City A.M. analysis, funds at Britain’s biggest wealth manager performed an average of 6.3 per cent worse tha…