Bear in mind that whilst you ATCOs get assessed on your R/T at regular intervals, the emphasis on R/T standards IMO takes a drop once a new pilot has been signed off on their line training.
When it comes to recurrent sim checks and line checks for us as crew, I feel that not enough emphasis (or none at all) is being put on R/T standards. That is obviously a view point from what I have seen but if you disagree with what I have said then hats off to your training department. Anyway... sometimes the chap driving the sim is not strictly sticking to CAP413 for starters!
In my limited 3 years of commercial flying R/T has been only brought up once during a training exercise and that was on my command course but if it was another F/O recurrent check then the comment might not of been brought up.