Correct me if I am wrong, but does THIS not depend on each country?
In UK you clear first the LOC only, and after the pilot report, that he is establish, you give him the clearance to descend on the ILS.
Further, in Germany, especially on the busy airports like Frankfurt or Munich, they often clear them also only for the LOC and afterwards they will be cleared to leave the present altitude with the ILS.
And in the Netherlands, at Schiphol, you dont get any ILS in your approach clearance. Its just " DLHXXX, clerared Approach RWY 18R".
Coming back to the question: Roger is the shortest and easiest one
