AJ 27.02.20 RetroFirst and the Circular EconomyThe AJ focuses on its RetroFirst campaign to prioritise reuse of existing buildings. We meet Maarten Gielen of Belgian circular economy focused design practice Rotor; and visit Civic Architects LocHal library a converted train depot in the Netherlands. As Historic England backs the campaigns call to slash VAT on retrofit, we look at the barriers the heritage sector faces to reusing buildings; we talk to four developers about a retrofit project each