A major computer error discovered in July that meant thousands of customers of Yorkshire and Clydesdale banks faced having to pay more for their mortgages has damaged customer confidence.
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According to mortgagestrategy.co.uk, quoting Financial Ombudsman figures, Clydesdale bank had 410 mortgage-related complaints in the second half of 2010 compared to 66 from January 01 to June 30.
In July the bank revealed a rounding error occurred when a system was upgraded in 2005.
The calculation error combined with a unprecedented rapid reduction in interest rates, resulted in some customers' regular payments falling below the minimum required to complete the mortgage within the agreed term.
A total of 18,000 customers faced having to pay more than expected.
Clydesdale did however do better than Santander, which had the most mortgage-related complaints of 475 in the second six months of 2010.