Modular and portable buildings, training facilities building, training and simulation in firearms and ammunition. The MOD has a requirement for providing Close Quarter Battle (CQB) training within internal building environments using live fire. Correspondingly there is a requirement for a modular partition panel system that allows the internal layouts of buildings to be replicated, with rapid assembly, reconfiguration and breakdown with minimal staff. To ensure safety the panels shall provide ballistic protection, preventing penetration from common UK Army ammunition natures.