Chart: Bank of England Base Lending Rate Against the UK Inflation Rate, since 1948

A historical chart showing the UK’s monetary battle with inflation. It tracks the wielding of the Bank of England’s base lending rate against the Retail and Consumer Price Indexes, from June 1948 to the present day.

Chart: Bank of England Base Lending Rate Against the UK Inflation Rate, since 1948

December 2021

On 16 December 2021, the Bank of England’s Monetary Policy Committee voted to increase the Bank’s base lending rate from a record low of 0.1 per cent to 0.25 per cent.

Markets had expected an increase back in mid-November but the Bank opted to hold position.

The increase in December was seen as risky at a time of heightened uncertainty following the discovery of a new Covid-19 variant of concern — Omicron — in late November. Markets and analysts anticipated the Bank would raise rates in January or February 2022, after more is known about Omicron. Consequently, the December decision to raise rates was surprising.

Fiscally, the government is due to raise taxes in April and is promoting a high wage, high skill economy with its Plan for Jobs.

In mid-2021, the heads of all major central banks characterised rising inflation as ‘transitory’. In October, the Bank of England’s new chief economist, Huw Pill, warned that UK inflation is likely to rise “close to or even slightly above 5 per cent” in early 2022, and the Bank had forecast inflation to exceed 4 per cent before the end of 2021.

UK inflation stood at 5.1 per cent in November 2021, the highest it has been since October 2008.

So, why is this important? Well, for one, it has an impact on how much the money in our pockets can buy. If inflation is rising excessively, as it is at present, the price of what we buy has increased. Unless, at the same time, we are earning more money, we will feel the increase in prices. It starts as feeling, as if we cannot buy as much today as we bought a few months ago, and this is usually because it has become a fact that we cannot buy as much today as we bought a few months ago. The price has increased, but our income has not. If our incomes have increased then we do not feel inflation, or a significant increase in prices, as much, or at all. So, it is probably wise to look at earnings, wages and household income when inflation is rising.

Another reason inflation is important is shrouded costs. When inflation goes too high, like it is at present, the Bank of England (BoE) usually responds by increasing its base lending rate, which has the knock-on effect of increasing mortgage rates. Banks and lending institutions increase their rates, and not always in-line with the BoE's increase. Nationwide has recently been criticised for increasing its rates on some of its products by three times as much as the base rate increase1H. Brennan, ‘“Kick in the teeth” for families as Nationwide raises mortgage rates further than Bank of England’, The Telegraph, 06-Jan-2022 [Online]. Available: https://www.telegraph.co.uk/personal-banking/mortgages/nationwide-hikes-mortgages-bank-englands-rate-rise/. [Accessed: 11-Jan-2022].

It is worth being aware of inflation because it can help with timing or expectations. For example, a mortgage on a house is now going to cost a little more than it did in November 2021, before the BoE increased its base rate. And if you are due to renew your fixed-rate mortgage, it may be wise to lower your expectation of finding a deal as good as the one you are leaving.

If you deal in, or hold stocks and shares, it is very useful to have a working knowledge of inflation. Inflation spooks markets, and it encourages them. For the last few years, inflation has hovered around two per cent, which is where the government wants it, so it has not been a significant concern for markets. But when inflation takes-off, the market reacts, and opportunities arise. So it is a good idea to keep an eye on inflation.

I've spent more time than I expected looking into inflation numbers and how they work in the UK — how they are compiled, a little about their history, and how they are calculated. It has even led me into the detail of how money works. It is all very useful and enlightening for those of use who buy, hold, sell, and speculate, on stocks and shares.

If you're interested, I have shared my findings in the articles listed below:

[list of articles required]


The chart tracks UK inflation — RPI and CPI — against the Bank of England’s base lending rate, from June 1948 to the present. A full-page, interactive version can be found here.

While the chart is interactive, it displays point details on hover, it is more useful as a historical overview. Charts tracking shorter timeframes give greater detail and are available in other articles which may be of interest, listed above.

The UK government used the Retail Prices Index (RPI) from its inception in 1947. The chart tracks RPI from June 1948.

The Consumer Prices Index (CPI) was launched in January 1996. Estimates, which are broadly consistent with the data from 1996, are also available back to 1988. The chart tracks CPI from 1989.

The CPI was adopted by the government as the official measure of inflation in December 2003.

Retail Prices Index (RPI)

Inflation was measured using the Interim Index of Retail Prices from 1947 to 1955. It was rebased and renamed the Index of Retail Prices in January 1956 and replaced with the General Index of Retail Prices based from January 1962. It was rebased again in January 1987, following the issuance of the first index-linked gilts. The RPI was also calculated excluding mortgage interest payments, known as RPIX.

Separation of Monetary and Fiscal Policy

In 1997, the UK government handed the setting of the base lending rate to the politically independent Bank of England Monetary Policy Committee. It became responsible for adjusting interest rates to meet an inflation target set by the Chancellor of the Exchequer — initially an RPIX of 2.5%. In simple terms, the government is responsible for setting fiscal policy — the inflation target — and the Bank of England wields the tools necessary to meet that target, such as interest rates. In December 2003, the government changed the inflation target from an RPIX of 2.5% to a CPI of 2%.


The Consumer Prices Index including owner occupiers’ housing costs (CPIH) was launched in early 2013 and became the lead inflation index in UK official inflation statistics on 21 March 2017.

Note that the UK government uses the CPI for its official inflation measure in its inflation targeting. For this reason, the chart tracks CPI and does not track the CPIH.

Chart Notes

  • Updated once a month with the latest Bank of England and Office for National Statistics data.
  • Includes current CPI and RPI data for comparison
  • Full-page interactive chart, here


  • Consumer Prices Indices Technical Manual, 2019 - Office for National Statistics. [Online]. [Accessed: 10-Jan-2022]


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