I have comprehensively covered this area of charges on AAM in the past. All the funds operating in this country work on the same fee basis. The only way to find out the exact level of costs applicable to funds is to find the TER (total expense ratio). But in good old Ireland this does not have to be reported. The only company that will will fully disclose the figures are Standard Life. The rest are a basket case and they refuse to release the details. There are loads of other hidden costs as well -- the B2 Y4 charges and the sales charges, which all amount to considerable amounts.
The article in the Guardian is probably a rfeplica to what I posted some 18 months ago. These report the complete facts, although Joe Public sticks his head in the sand. The best investments (IMO) are ETFs which have minimal costs but are investing in the same type/class as shares.
RABO funds are similar but if my memory serves me correctly, the charges are higher in their funds compared to most (not all) other funds.