I might be wrong, since i am just a trainee, but i thought that "cleared for ils rwy XX" meant the acft was cleared to intercept and follow the localizer, then the glide path and descend until the landing (when cleared from twr) or MAP, as stated in the proper chart.
Even more, ICAO's "cleared for ... approach" also clears the a/c to execute go-around, which is part of the approach procedure. UK phrase does not mention that, maybe CAO should add some extra words to cover it?
