Sterling has been through a dollar peg, a forced devaluation, a failed attempt to shadow the Deutsche Mark and a political shock that nobody priced in advance. Its behaviour today is easier to read if you know which of those episodes actually changed the rules.
There are five dates worth remembering. The rest is detail.
1967: the last big devaluation
For two decades after the war, the pound was pegged to the dollar under the Bretton Woods arrangements. A peg is a promise to defend a price, and defending a price costs reserves. On 18 November 1967, the government gave up and devalued sterling from $2.80 to $2.40, a cut of 14% according to the UK government’s own history blog.
The lesson for a currency watcher is mechanical. A fixed rate that markets doubt will be tested, and the test usually ends one way. The same story returns in 1992.
1992: Black Wednesday
In October 1990 Britain joined the Exchange Rate Mechanism (ERM), the European system that kept member currencies within a band, at a central rate of 2.95 Deutsche Marks to the pound. Two years later the band became impossible to hold.
Heavy selling of sterling built up on 15 September and reached its peak on 16 September 1992. The Bank of England bought pounds in large amounts, and the Treasury later estimated losses of £3.3 billion. The government raised its base rate to 12% at 11am, then announced a rise to 15%. It did not work. That evening, the Chancellor announced Britain’s withdrawal from the ERM.
Afterwards, what changed? The government adopted inflation targeting, and as one account puts it, euro membership became effectively off the table. Sterling has floated freely ever since, and that is why the pound can move in a week by more than a pegged currency does in a decade.
1997: the Bank gets its independence
Days after taking office, on 6 May 1997, Chancellor Gordon Brown announced that the Bank of England would set interest rates independently. A new Monetary Policy Committee, a mix of Bank officials and four external members, would meet monthly and vote on Bank Rate, aiming at an inflation target set by the government.
This matters for exchange rates because interest rates and credibility drive currencies, and credibility is easier to hold when rate decisions are visibly insulated from the election calendar. Bank Rate stood at 3.75% at its September 2026 meeting, as published on the Bank’s website. A rate decision that differs from what markets expected can move the pound within minutes.
2016: the referendum
Voters in the UK were asked about EU membership on 23 June 2016. The Bank of England’s review of markets that quarter records “large falls in sterling exchange rates” as the result came in. The National Institute of Economic and Social Research later noted that sterling had declined by over 12% against the dollar since the referendum date.
No interest-rate decision caused that. What moved the pound was a change in expectations about trade, investment and the future of the UK’s economic relationships, all repriced at once. Currency markets are forward-looking, so news about the likely path can matter more than the eventual outcome.
2022: the mini-budget
Another Chancellor, another September: on 23 September 2022 the Chancellor announced a package of large tax cuts. By Monday 26 September, sterling had dropped to a record low of about $1.035 against the dollar, according to market reports that day. The drop followed the announcement, and commentators linked it to doubts about the plan.
It was a reminder of the mechanism behind the 1992 episode, only in a floating system. Investors do not need a peg to punish a policy they distrust. They just sell the currency.
The five dates side by side
| Date | Event | Regime | Number worth remembering |
|---|---|---|---|
| 18 Nov 1967 | Devaluation | Dollar peg | $2.80 to $2.40, minus 14% |
| 16 Sep 1992 | Exit from the ERM | Band against the Deutsche Mark | Base rate 12%, then 15% announced the same day |
| 6 May 1997 | Bank of England independence | Floating | Inflation target set by government |
| 23 Jun 2016 | EU referendum | Floating | Over 12% down against the dollar afterwards |
| 26 Sep 2022 | Record low after the mini-budget | Floating | About $1.035 |
Only the first two are failures of a fixed rate. The last three happened with a free float, and the pound still moved by double digits in the 2016 case and several percent in a few days in 2022. Floating does not mean calm. It means the price adjusts continuously instead of waiting for a crisis.
What actually drives the pound
Strip out the dates and a few forces recur.
- Interest-rate gaps. If UK rates look high compared with US or euro-area rates, holding pounds pays more. Money flows in, and the pound tends to firm. The reverse also holds. What counts is not the rate but the gap, and what markets expect the gap to become.
- Credibility. Markets reward policies they trust and punish ones they doubt, as 1992 and 2022 both showed.
- Politics and trade arrangements. 2016 is the clearest case.
- Global risk mood. When investors turn cautious, they tend to prefer the dollar. Sterling is one of the world’s most traded currencies, but it is not the first place people run to.
Sterling’s weight in the market is real. The Bank for International Settlements found the pound on one side of 10.2% of foreign exchange trades in April 2025, a smaller share than the 12.9% of 2022 but still the fourth most traded currency by those figures. A Federal Reserve note put sterling at 5% of disclosed official reserves in 2022, against 58% for the dollar. Being heavily traded and being a reserve currency are different things.
What a 12% move does to real money
A worked example, with illustrative numbers rather than quotes. Say a made-up UK student has a US university fee of $12,000 due after the pound falls. Before the fall, at $1.30 per pound, the cost is 12,000 / 1.30 = £9,230.77. If the pound loses 12% of its dollar value, the rate becomes 1.30 x 0.88 = 1.144. The same fee now costs 12,000 / 1.144 = £10,489.51.
That gap is £1,258.74, for a bill that did not change in dollars. Notice also the asymmetry: a 12% drop in the pound is a 13.6% rise in the sterling cost of the fee (10,489.51 / 9,230.77 = 1.136). Percentage falls and the matching rises are never equal.
For anyone paid in pounds who sends money abroad, or paid in dollars who spends in the UK, this arithmetic is the whole story. You can follow it live on GBP to USD or, for money sent to South Asia, on GBP to INR. Rates refreshed hourly. The full set of sterling pairs is on the British pound page.
History gives you the mechanics, not the next move. Economists have models for the pound’s long-run value, but none predicts next month reliably, and anyone claiming otherwise should be treated with suspicion.
Practical habits are modest. Do not time a large conversion around a rate announcement unless you can afford the risk. If a payment is due on a fixed date, it can be sensible to convert in stages. Check what you actually receive after your provider’s margin, since the rate you see on a converter is a reference point and not a guaranteed price. And treat any claim of a “safe time to send” as a guess.
Sources
- UK Government History blog: 18 November 1967, devaluation of sterling
- EconLib: Wednesday, Black and White
- Bank of England: Twenty years of BoE independence
- Bank of England Quarterly Bulletin: Markets and operations, 2016 Q2
- NIESR: Dissecting sterling’s fall
- FXStreet: Pound falls to record low versus the dollar (26 September 2022)
- Bank of England: Bank Rate
- Federal Reserve FEDS Notes: The International Role of the U.S. Dollar, Post-COVID Edition
- BIS: OTC foreign exchange turnover in April 2025
Checked: November 2026
