No mezzanine around ST5. It is a better space than ST3, and since GMTV's departure, has been fully fitted to HD. Only downside is the lower ceilings and lighting rig,
which have to be factored into set-design
. It's better for the production team too, who can walk from the 4th floor to the 3rd in seconds, as opposed to the 5 minute commute to ST3 and ST7