yes but we aren’t dealing with English English spoken at normal rates.....
Yes, I know. That was kind of my point ! 
CAP 413 might seem stilted and silly, (and is UK), but I use its methodology, and have rarely had a problem being understood. I am sure some US ATC probably think I am being a ****, or am trying to be posh, but neither is true - I am just trying to be understood clearly, because clear communication is a real safety issue. 