Tango route clearance question
Hello,
I have a question which hopefully can be answered here.
Flying south on T16 (training flight for MNPS approval) and requested FL 370.
370 Wasn't available so we had a reclearance for FL360. Shanwick prefixed the actual clearance with a phrase (which I can't remember precisely) but the thrust of it was to alert us that the clearance we were about to recieve was different to the the one we requested. This heightened our awarness and helped prevent the possibility of us writing down the clearance we expected to hear.
Return leg from TFS and Santa Maria gave us a clearance with a level change but no heads up the "what you are about to recieve" is not what you asked for.
Is there a standard procedure for this or was the Shanwick controller just being cautious.
Thanks