The dollar stood tall on Wednesday, holding at a 20-year peak against the euro and multi-month highs against other major peers
The yen is sensitive to interest rate differentials between Japanese debt and US bonds.
Boris Johnson is reportedly set to announce a return to imperial measurements of pounds and ounces as a post-Brexit move away from the metric system to mark the Queen's Platinum Jubilee next week.
The U.S. dollar index edged lower and was down 0.2% on the day at 95.846 by 0831 GMT
The dollar was quiet at the start of a week in which central bank meetings, including by the Federal Reserve, will likely drive currency markets
The euro was down 0.1% versus the dollar at $1.1686.
The remarks sent the pound higher as much as 0.3 per cent
LONDON (Reuters) - The British pound gained a percent against the dollar and the euro in relief after Britain and the European Union agreed to continue talks on post-Brexit trade beyond Sunday's deadline.
Strong currencies reflect strong economies
Investors were also focusing on whether US President Donald Trump will impose tariffs on nearly $160 billion worth of Chinese consumer goods from December 15.
Strategists see pound support on bid to block no-deal Brexit
As the clock ticks toward the October deadline, the worry for some is that a deal could come late at night, taking any announcement into the so-called witching hour between New York and Tokyo trading
Expected defeat for May in Brexit vote to boost volatility
The depreciation also brings cheer for those looking to study and invest in the UK
The pound surged after a court ruled the UK can't start the process of leaving the EU without approval
In January, the South African rand tumbled more than 9 per cent in 15 minutes before rebounding
A spokesman for the Bank of England told AFP that it was "looking into" the cause of the flash crash
The pound recorded its biggest gain since July 15
Inflation and labour figures covering the pre-Brexit period, released earlier this week, beat analyst predictions
British pound has fallen to a 31-year low, leaving it 13% weaker against the dollar