Folks,
Remember that in the UK maybe 90% of gliders have only a basic radio with the following frequencies -
130.1 MHz - Air to air and air to ground
130.4 MHz - Air to air - for cloud flying
129.75 MHz (?) - Ground movement (?)
and sometimes they'll have VOLMET
Only newer / high specification machines or motorgliders will have the full "light aircraft kit".
Most gliders will be listening out on 130.1 MHz. (Although some people have it turned up louder than others - enjoying the silence perhaps !).
So you won't hear them anywhere else.
Gliders so equipped should be avoiding controlled airspace where other frequencies would be needed.
D 129