Difference Between RPI, CPIY, CPI-CT and CPI
RPI, CPI and RPIX are three different measures for calculating inflation. To summarise CPI = headline rate (excludes mortgage interest payments, housing costs) RPI = Retail Price Index. Includes mortgage payments. Source: ONS In 2009, the UK saw a cut in interest rates, and therefore, a fall in mortgage repayments. This caused RPI to become …