Many investors believe they are diversified because they own multiple shares, funds or ETFs. The reality is often very different. This guide reveals the hidden diversification problems that can exist inside apparently well-balanced portfolios, including ETF overlap, concentration risk, sector dependency, geographic bias and correlated holdings that increase risk without investors realising it.

Most investors don’t control their portfolio allocation — they drift into it. This guide shows how to build a simple Excel allocation spreadsheet to track weightings, manage risk, and stay aligned with your investment strategy.