And further to Hempy's post,
Have you listened out on 135.7 in the last 10 years? it is a VERY busy Frequency, totally loaded with IFR guys
Its busy enough, that I doubt the controller on it is monitoring any extra frequencies....he/she would be glad the days of vfr's requesting QNH are pretty much gone.
If there is one area with what I have described, there are surely more...