Just a short distance from Oxford Street, Premier Public Relations’ office is a self-contained 19^th century industrial building spread over five floors in Bucknall Street, London. Cost effective window improvements for their offices was needed. This was to ensure a more agreeable working environment to achieve a high level of thermal insulation. Although this was the main aim, Premier was also interested in what could be achieved to improve noise attenuation. Following on from an in-depth discussion on the best treatments for the draughty openings, 115 secondary glazed windows were installed across the ground, first, second and third floors. A wide range of products were combined for the specification, the majority of which were Series 10 two and three pane horizontal sliders. The Series 30 lift-out unit was specified for one particular opening to allow easy access for cleaning.  Another primary window was fitted with a single side hung casement, designed to suit the existing fenestration. The minimal frames created clean lines complimenting the existing primary windows, making them unobtrusive and virtually unnoticeable. Since this project was completed the Series 30 has been superceeded by the Series 31 lift-out.