The pound struggled at 32-year lows against the dollar in Asia on Monday after reports said British Prime Minister Theresa May was ready to take the country out of the European Union in a so-called "hard Brexit".
Sterling's retreat came with losses on most Asian stock markets as investors nervously await Donald Trump's inauguration speech on Friday, having been left disappointed at his lack of detail on economic policy at a news conference last week.
A number of Sunday newspapers in the UK said May was willing to pull out of the single market, the European customs union and the European Court of Justice, in order to regain control of immigration.
The news sent sterling plunging to US$1.1986, its lowest since October's "flash crash" that sent it to US$1.1841 — a level not seen since the start of 1985.
The unit later made up some of the losses to reach just above US$1.20.
AFP / Gal ROMA Pound vs dollar
"The weekend reports were undoubtedly the factor that pushed the pound down," said Nomura forex strategist Yoshitaka Suda. "Markets are watching what Britain does."
The reports come as May prepares to give a speech Tuesday on the government's strategy on leaving the EU.
The PM aims to launch two years of departure talks when she triggers the Article 50 exit process by the end of March, although a legal challenge is still pending before the country's Supreme Court.
“Even if the pound recovers somewhat in London, it seems as though the realities of a hard Brexit are still not fully priced in,” Sean Callow, senior strategist at Westpac Banking Corp. in Sydney, Australia, told Bloomberg News.
“It is difficult to make the case for the pound to avoid testing, probably breaking, the ‘flash crash’ lows in coming weeks.”
Regional stock markets were also under pressure as dealers look ahead to Trump's inauguration Friday with uncertainty.
World equities surged after his election win in November on bets his plans for big infrastructure spending and tax cuts would fire the world's top economy, and in turn the global economy.
But the lack of any definitive plan at last week's briefing left many scratching their heads and worrying he might not fulfill his promises.
Tokyo ended one percent lower as a pick-up in the yen against the dollar hit exporters, while Hong Kong also shed one percent. Shanghai ended down 0.3 percent.
Seoul lost 0.6 percent, Singapore retreated 0.7 percent and Taipei slipped 0.9 percent, although Sydney edged up 0.5 percent.
In early European trade London rose 0.2 percent on the back of the weaker pound, but Paris fell 0.5 percent and Frankfurt lost 0.6 percent.