The ILS thing is a pain.
The UK position is that the ILS approach charts are designed with respect to terrain, but not airspace. This results in, say, a level ("platform") segment of, say, 2000 feet, running into the ILS glideslope.
The problem is that there may be a VFR corridor in that piece of airspace, crossing at 90º
underneath the ILS. The UK are concerned that, if they say
"Descend to 3000', cleared ILS" that the pilot will descend to 3000', intercept the localiser, look at the chart (with a 2000' platform) and descend to 2000' to fly level before
then intercepting the glide slope! This interpretation of what an insane pilot might do, would mean that they might descend into un-notified crossing VFR traffic at 2000'
That is why it takes twenty radio calls to intercept an ILS in the UK.
