Raggytash:
Two things here, one an assumption that the rest of the world will help us and two the recovery period is 13 (THIRTEEN) years.
The 13 years is not surprising, this is based on forecasts of how things will stand in 2030.

"Because of course, in principle, I share the views of many that Brexit is a really weird thing for the UK to impose on itself from an economic perspective." Even O'Neill thinks Brexit is damaging economically
Again, not surprising. your second paragraph gives him as "a Remain supporter".