Hi keith - I've been following your thread on Tech Log with interest.
I am of the opinion that the author of the article in GASIL 4/2003 may be guilty of loose wording and is in fact referring to airports where CDAs are standard procedure. ie the London airports and where the ideal profile is to intercept the glide-path at the appropriate height for the distance without recourse to level flight.
I think the phrase "specifically published" probably refers to the UK AIP entries for these airports where detailed procedures regarding the requirement to attempt to achieve CDAs at all times are laid out.
As far as I am aware at other UK airports CDAs are considered to be a "best practice" to be aspired to when possible, but normal practice would be to intercept the glide-path from below.