Replacement of the existing windows including extractor fans & external doors with new aluminium-d, thermally-broken argon-filled, low-emissivity double-glazed units, including all associated insulated filler/spandrel panels & teleflex winder-opening mechanisms, along with upgrade to reveals including; insulation / air-tightness, making-good, new cill boards and liner panels and new blinds to all windows in teaching spaces.