How much will Brexit cost Britain?

British Prime Minister Theresa May on Thursday met with EU leaders for talks on Brexit concessions. Once again, EU have refused to renegotiate, leaving Britain facing its weakest economic growth in a decade. After the decision to leave the EU was made, many institutions have tried to estimate the economic impact on the UK's economy once it happens. Last November, the UK government produced its own version. What did they come up with? CGTN’s Yang Zhao has the overview.