Hi @TomCooper,
You say you used the same strategy with the same analysis on both demo and live trading, but got different results.
Is it possible you could have overlooked some important differences? Between your demo account balance and your live account balance? Between the market conditions (volatility, trends, correlations, etc.) during the time you were demo trading and the time you were trading live?
The following thread discusses this topic in more detail: Demo = win , live = loss