ST, I understand why you feel strongly about this, but I do ask you to keep a sense of perspective. Yes, I expect a few gliders sometimes infringe CAS without speaking to ATC.
But not nearly as many as GA power pilots. Of 106 recorded infringements of Stansted CAS in 2008, none of those identified was a glider, two were balloons, and the rest were power or “unknown”. My conversations with NATS suggests that no “unknowns” in this case were gliders.
Do you have any countervailing statistics?
Regards – Chris N.