Apart from the charges, you must consider what sector the fund is invested in. Just from it's name, The Global Leaders fund is probably a large cap growth fund(LCG). Arter leading the market for 5 years(1995- 2000) and running up incredible returns, LCG has been underperforming for 5 years now. Look at the charts on microsoft, intel, cicso, walmart astrazenica vodaphone.
I think LCG is RELATIVELY cheap. This might mean it just goes down less in a correction.
Do not sell now. Inexperienced investors tend to pile in late on a trend and then regret it at their leisure. China/ India is flavour of the month now. Do not sell this fund to buy some China/ India fund.
Go ahead and change to a low cost index tracker if you must but I would not leave the LCG sector.