Oliver Mangan: Brexit is rapidly turning Britain into an economic laggard

The British economy has slumped since Brexit became a reality, going from the strongest to the weakest of the G7 members.
The recoveries in the UK and US economies have lost considerable momentum since the middle of the year.
GDP growth slowed to 1.3% in the UK in the third quarter, down from 5.5% in the previous quarter. A marked deceleration was expected after output rebounded sharply in the second quarter when the economy reopened, but not on this scale.