I'll just add my pennies worth,
I always give the Holding Point Designator with either a Line Up / Take-Off Clearance.
e.g. BMI2772, via A1, RWY 30 Line Up & Wait / Cleared For Take-Off
Just recentley through our Runway Safety Meetings it has now been decided that we should give the Holding Point Designator with a Line Up / Take-Off Clearance if the aircraft is depating from the last available Holding Point (Not Mats Pt 1. Required).
Seems to work fine here as it's more of a spacial awareness thing for other users on the R/T and not so much the departing aircraft (Like someone said above the only way onto the runway is where they are already). We have a lot of VFR traffic that departs from intermediate HP and numerous Free Ranging Vehicles on the airfield. I just think it build up a better picture for them as to who's doing what from where.
Regards, V801