It couldn't answer that question for the simple reason the campaign party for out was just that , a campaign party.
No plan , no policies as they have no power to instigate any changes .For instance , Nigel Farage isn't even an MP.
Only had one directive , to get us out of the EU
The remain party knew they can't have a plan and that's why they kept asking the question!!!!
It's now upto government to decide what now.