In 1988, the United Kingdom’s currency situation was dominated by the government's exchange rate policy and its battle against inflation. The pound sterling was not part of the European Exchange Rate Mechanism (ERM), as Chancellor Nigel Lawson was pursuing a policy of "shadowing" the Deutsche Mark. This unofficial peg aimed to import the anti-inflation credibility of the Bundesbank by maintaining sterling within a narrow band around DM 3.00. However, this policy was conducted covertly and created significant tension within Margaret Thatcher's government, as it involved subordinating domestic interest rate policy to the goal of currency stability without any formal agreement or democratic oversight.
Economically, this period was characterised by the "Lawson Boom," a consumer-led surge in growth and credit expansion. This boom, fueled by tax cuts and financial deregulation, put upward pressure on sterling and worsened a growing current account deficit. The high interest rates required to maintain the sterling-DM peg (reaching 13% by mid-1988) attracted hot money flows, further strengthening the pound and damaging the competitiveness of British exporters. The situation created a policy dilemma: the high rates needed for the exchange rate target were exacerbating domestic inflationary pressures from the booming economy, a contradiction that highlighted the unsustainable nature of the shadowing policy.
The currency strategy ultimately proved untenable and sowed the seeds for a later crisis. Prime Minister Margaret Thatcher was deeply suspicious of the ERM and of Lawson's de facto policy, leading to a major rift. By early 1988, she began to overrule him, forcing a break from the DM shadowing and allowing interest rates to rise more sharply to tackle domestic inflation directly. This episode of policy conflict and the failure of shadowing demonstrated the difficulties of managing sterling independently. It directly influenced the UK's eventual, and ill-fated, decision to join the ERM in 1990 at what many argued was an unsustainably high central rate, setting the stage for Black Wednesday in 1992.