The following might explain why Gander get narked when asked for HF for EGGX on first contact...
A3942/16 NOTAMR A2992/16 Q) CZQX/QAOCH/IV/NBO/E /000/999/5454N04327W999 A) CZQX B) 1606231646 C) 1609302359 E) GANDER OCEANIC AREA CTL WILL ISSUE THE 30 WEST EASTBOUND HF FREQ TO FLT ENTERING SHANWICK OCEANIC CTL AREA USING CPDLC(UM117) RATHER THAN HF VOICE. CREWS WILL BE ISSUED A PRIMARY HF FREQ FOR SHANWICK APRX 15 MIN PRIOR TO 30 WEST BOUNDARY. IN THE EVENT THAT CREWS DO NOT ESTABLISH CTC WITH SHANWICK RDO ON THE ASSIGNED PRIMARY FREQ, CREWS ARE ADVISED TO CTC SHANWICK RDO ON A PUB HF FREQ AS PER AIP IRELAND GEN 3.4.4 OR USING THE SELECTION BLW: FREQ OPN HR 2872KHZ 1800-0900 5649KHZ H24 8879KHZ 0900-2100