A number of leading asset managers have introduced premium prices on popular products and specialist mandates ahead of the move to unbundled pricing next year.
M&G reported a 53% rise in net investment flows in the first half of the year, with retail investors driving the £4.3bn of flows.
The continued squeeze on liquidity in the corporate bond market could lead to the closure of larger funds to investors and even cause parts of the corporate bond and gilt markets to shut down.
M&G's Richard Woolnough said the possibility of another £375bn in asset purchases by the Bank of England means gilt yields could remain at record lows for years to come.
UK Money Market funds swung back in favour in May as investors looked to shelter money amid the ongoing eurozone debt crisis, according to figures from FundsNetwork.