Hi MJ,
To be honest, I don't know one way or the other. I thought I recalled a fairly recent thread where somebody was adamant it was not an appropriate or authorised (according to the regs) use of voice radio within the air communications band.
http://www.pprune.org/private-flying...ml#post6818864
Daft to me that it works brilliantly in the USA but seemingly cannot be used here (whether anybody would do anything if it got installed is another question).