amberale and blip,
The point I make, is that Jepp ATC 700 series 1.9.1 states that a speed variation on decent of + or - 10 kts or 0.025M must be advised to ATC as RPT Jet operators are 'supposed' to nominate a standard profile. If ATC ask me 'what is your decent speed' and I say 'Oh we're at CI 10' that means f@ck all to them. If my company alters a standard decent profile (like altering CI does) and does not advise ASA then they are at fault for not advising them.
We have no room to move wrt alterning CI, if thats what is nominated, then thats what they get unless we are advised by ATC to speed up or slow down or the company advises us to the contrary. Even if we are late, early or on time, the CI stays the same, there is no room to move. Thats is the point.