Despite the RT licence permitting the holder to operate the radio in any aircraft, the exams contain VFR calls only.
I started a thread on this a couple of months ago as the practical exam was looming for me:
http://www.pprune.org/private-flying...ical-exam.html
Hope this helps
Gav.
www.madgav.org
www.gmcc0266.plus.com/ppl.htm