Bestinvest says
This is an expensive tracker fund and although it specifically targets the top 350 companies in the FTSE All Share index, it will largely follow the fortunes of the FTSE All Share index as the top 350 stocks represent a large proportion of that index. A more cost efficient option is Fidelity Moneybuilder UK Index, which with a total expense ratio of just 0.3% is one of the cheapest FTSE All Share trackers.
Tracker funds have an inherent problem as performance fees reduce the margins on performance. Always check the performance fees against similar products before investing in these types of fund.