 Prior to the effect of the Retail Distribution Review it was normal for S&S providers to be paid by fund managers out of their usual charges, though some may have both explicit dealing charges and collect the commission while others may make charges and refund all commission.This is now prohibited for new customers who must be charged a fee instead.In the current transition period existing customers may be able to hold a mixture of commission paying investments and the "clean" versions that do not pay commission, perhaps paying a platform fee only for the clean portion.