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This project posed many issues for OAG's design team. Using up to five designers at times, the team overcame very complicated movement issues, with simultaineous movements of up to +/-40mm in the length of the construction, +/-15mm across the width of the construction and +/-25mm vertical deflection to be accomodated.

The movements were particularly difficult to manage around the doors within the departures travelator enclosures, pictured. The problem was solved by using a combination of suspended bolt fixed glazing with cantilevered glass fins and automatic doors framed in a ground based portal frame.

This arrangement allowed the differential movements between the platform level above and the undercroft level below to remain isolated, whilst providing a sealed, and secure enclosure. The end result is an installation which seamlessly interfaces with all adjacent finishes and hides the complicated design issues perfectly.

The bespoke glass balustrades, travelator enclosures and shop fronts have been designed to accommodate the original constant fall in the floor level as well as the plus/minus 40mm multi-directional movement and tolerance of the original historic structure.

Additionally the manufacturing and installation tolerances of each individual component as well as the assembled end product had to be exceptionally accurate, in order to fully satisfy both the aesthetic and performance requirements of an important Grade 1 listed building'