Internal works to Bay 1 to include refurbishment of WCs and showers, construction of partition walls with associated doors, installation of extraction systems, construction of mezzanine structure with balustrades, installation of new staircases, infill of internal windows and creation of new door openings, replacement of internal doors; External alterations to include insertion of infill panel and pedestrian door to existing folding door on south elevation and rooftop installation of discharge cowl for extraction system