PPRuNe Radar,
Thanks for the answer. Only Hard Evidence matters when you have disagreement in cockpit.
It is my opinion that knowledge about this got lost in everyday operation. Pilots are doing original restrictions even when it's not repeated because they are not quite sure, and since they always do, ATC slowly forgot it needs to repeat it. And as we all know not many people bothers to go through books again from time to time. Especially if the things are going well.
I think thing are clear for UK airspace. Is there anybody from other European ATC who would like to comment?