at current levels rather than reduce them in line with the RPI, but the Treasury concluded that rents should follow RPI down as far as −2% per annum, leading to savings in housing benefit. In February 2011, annual RPI inflation jumped to 5.1% putting pressure on the Bank of England to raise interest rates despite disappointing projected GDP growth of only 1.6% in 2011. The September 2011 figure of 5.6%, the highest for 20 years, was described by the Daily Telegraph as "shockingly bad". After a thorough review, in 2012 the National Statistician's Consumer Prices Advisory Committee (CPAC) determined that due to the use of the Carli formula in certain subcomponents, the RPI is biased upwards compared to other indices by a "formula effect" of roughly one percentage point. CPAC concluded that "the use of the Carli formula is no longer appropriate" due to the weak axiomatic properties of the Carli method. (The weak property is the fact that after a price bounce and a subsequent full return to original prices, the Carli method shows positive aggregate inflation.). In 2013, following a consultation on options for improving the RPI, the National Statistician concluded that the formula used to produce the RPI does not meet international standards and recommended that a new index known as RPIJ be published. Subsequently ONS decided to no longer classify RPI as a "national statistic". However, ONS will continue to calculate RPI, among several versions of the inflation index, in order to provide a consistent historic inflation time series. The index factors continue to be used to adjust for inflation in the calculation of chargeable (capital) gains for inclusion in the tax computation for entities subject to corporation tax in the UK. In January 2018, Mark Carney, Governor of the Bank of England, said that RPI should be abandoned. In November 2021, inflation has risen faster than projected to its highest level in nearly a decade, putting pressure on the Bank of England to increase interest rates. According to data from the ONS, the annual rate of the CPI increased to 4.2 percent in October, up from 3.1 percent in September. Inflation surpassed the Bank of England's target of 2% and was higher than the 3.9 percent predicted by experts. Higher rates for transportation, restaurants, and hotels mainly contributed to the price increase in October. Calculation The United Kingdom RPI is constructed as follows: A base