Why are "leader" vehicles used for stand 27/29? I can't recall which, but it seemed an unnecessary expense as the lead-in markings are perfectly clear and no marshaller is required.
As an aside, those "leader' drivers often drive far too slowly for a jet to follow them comfortably. Particularly on a single-engine taxi in, smooth speed control is needed from the jet driver's end to allow fuel savings by not making large changes to the thrust setting. Any answers?