If the above persons did, in fact, constitute the WG, I think that there would be serious doubts about what one or two could have contributed to this particular issue, whatever their expertise in other areas.
More to the point, looking at the phraseology - it also applied previously - having given avoiding action with an immediate turn, why do they all think that it is appropriate to (a) continue rabbitting rather that obtain a prompt readback of this essential and urgent instruction, and (b) pass traffic information using the clock code rather than cardinal points, the aircraft, at this stage, being thrown into an urgent turn?
AND ANOTHER THING!! WIH is all that change to Radio Check phraseology all about? (Adopts V Meldrew tone) I do not believe it!!!