The main proposals set out in the U.K. Financial Services Authority's (FSA) mortgage market review (MMR) include the use of a standardized approach to assessing consumers' ability to repay a mortgage. One of these is the verification of a borrower's income to qualify for a new mortgage.

Although prepayment rates of existing mortgages might be impacted by more robust underwriting techniques, Fitch Ratings said it does not expect existing RMBS ratings to be affected.

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