there cant be that many trianing calls wasting time on the D&D, several occasions I've been asked whilst travelling north to scotland, to call them for thier practice .
Incidentally I now fly commercially into europe on a daily basis and commercial pilots are definately the worst offenders of misuse of the frequency.
Nothing worse than trying to listen to a controller pass a freq change/heading/alt just to have 121.5 blast into life with some **** talking to his mate. As said early normally results in turning the thing down to a level where you can only just hear voices, so could be anything going on.