I’ve had a few experiences of the new system since it went live. LHR have been consistently good at only calling Group 1 first and policing it. All T5 if that makes a difference although I have a long haul T3 departure tomorrow which I can report back on.
Outstations more hit and miss. GLA appear to be calling 1,2 and 3 together (normally half the plane) so no real benefit of being in Group 1.
AMS was very good and only called G1 which they policed well.