The FSA has defended its stance towards the commission ban but conceded the new charging structure could still be biased.
Responding to a TSC grilling in today's public evidence session on RDR, chief executive Hector Sants acknowledged the new system could still be subject to an element of bias.
Under the regime ushered in by RDR, Sants admitted different products could have different payment rates.
"But this is still much improved from where we were,"said the FSA chief executive responding to a question from the committee.
Sants went on to describe himself as a "cautious regulator" and said he will never claim the regulator has a 100% success rate.
Meanwhile, FSA director of conduct policy Sheila Nicoll revealed the regulator will collect advice charging data from firms as part of a "targeted approach" to the area of commission.
Since putting out the call for public submissions in December, MPs on the TSC have waded through around 250 pages of evidence on the RDR, including many sent in by IFAonline readers.
The TSC collected 203 submissions on the RDR from IFAs, providers and trade bodies.
Would create €1.4bn giant
Will work alongside de Bunsen and Webster
Briggs headed up insurance business