Boris Johnson is quitting as Tory leader after ministers and MPs - including new chancellor Nadhim Zahawi - made clear his position was untenable.
Mr Johnson looks set to stay as Prime Minister until a successor is in place, expected to be by the time of the Conservative Party conference in October.
At 9.23am the pound was trading higher on the news of Boris Johnson’s resignation – up 0.6% at 1.198 US dollars and 0.4% stronger at 1.174 euros.