Originally Posted by SmoothCruise
But there's things such as an A/G Radio Operator using the words At your discretion. Although the pilot won't fuss about you saying that on A/G, but it's not the correct phraseology and you couldn't get in trouble for it...
See CAP452 Chapter 4 Para 4.2:
"Those who operate Aeronautical Radio Stations and provide an AGCS are reminded that they must not use the expression 'at your discretion' as this is associated with the service provided by a FISO."