keithl - yes thanks for answering- explains it perfectly. I had searched and found a caa
localiser approach chart for sumburgh r/w 09 - I think - but I won't pretend I could understand the chart fully - although I can see the glideslope heights which it was on at 3 miles out before things started to go wrong according to aaib report.
Edited to add - when I have had the best seat in the house (for watching and learning - not escaping!) and the curtain has been open I have watched ILS landing in Aberdeen and can see how easy it is to monitor progress against glideslope.