“We want to make the National more porous. We want to knock through those brick walls at the back, so people are able to look into our workshops. I’d even float something that would horrify most of my colleagues: that rehearsals should be visible and accessible. People are fascinated by how the performing arts are put together. Theatre has been slow to catch up on this. We’re also planning to go greener by creating a park on the roof of the building.”