Consumer rights organisation Which? has said that the failure of a "sizeable" number of companies to implement processes for treating customers fairly is "a real cause for concern".
The comments came as the Financial Services Authority (FSA) made an interim report on its Treating Customers Fairly campaign.
According to the FSA, overall response on the part of the consumer-facing organisations targeted has been "good".
However, several large organisations have yet to produce evidence of their commitment to treating customers fairly, despite the FSA imposing a March deadline.
Which? group spokesman Dominic Lindley commented: "People will still be buying financial products over the coming months and these results show there is a real chance that they could unwittingly visit a company which isn't up to scratch."
He called for the FSA to take "stronger action" against companies that were failing to implement the required measures.
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