Every Friday, we compare rates for our existing residential mortgage customers looking to switch deal to the corresponding remortgage rates of the 6 largest high street mortgage providers, NatWest/ RBS, Halifax, Santander, HSBC, Barclays / Woolwich, Lloyds. These lenders are fixed for the year and will be reviewed on an annual basis every September. If we then need to lower any of our rates to ensure they are below our competitors, they’ll become available the following week.