Sonnendec, I think you may have mis-interpreted what I said.
Even in ICAO when you give a pilot "cleared ILS RWxx" he should maintain his level until established on the LLZ then leave that level and descend with the glidepath.
There is no requirement to ask for further descent unless the pilot feels he is too high for that position and point of intercept.
There could be traffic and or terrain reasons why you should maintain that level given by ATC - though most ATC I know would give a reason esp if was an unusual level due traffic below etc.
ie. don't just descend to minima cos "he cleared us"!
Mytupence worth ... correct me if I'm wrong.