So are you saying that the leaders of the Leave campaign had no thoughts about how they would tackle the key issues?
They can have all the thoughts they want but they were denied access to EU related government "machinery" because the government took a stance of supporting staying in the EU.
The leave camp will have ideas and thoughts of how to tackle the key issues but without access to the civil service departments that are experts in the area that would be just talk. That is not how government works. The civil service are the planners, the developers and the implementers of policy and politicians are the ones that choose the direction. The civil service does all the actual work.
It is much simpler to understand if you look at the USA. Obama could promise all he wanted but without the support from below he could not do anything. Trump will be the same. Just a figurehead with no actual power. It is a facade.