While it's highly likely you've heard of double glazing – window made with two panes of glass separated by an air gap for ...

That means the window is double-glazed, which is a good thing. But it also indicates the gap between the panes is no longer ...

Almost 1,300 new panes of glass have now been fitted in the ... includes the refurbishment of the atrium's ceiling with new glazing and lights, as well as the restoration of two smaller canopies.