Direct contact with SRG by HIAL ATCOs has been going on for many years.
When I was with the company, there was so little faith in management that the Head office was bypassed by the ATC staff as a matter of course.
It would appear that, as ever, the head office management are only interested in asking "how high?" when the puppet of a MD says "Mc Jump".
What HIAL really needs is to be put into the private sector, then the taxpayers of the UK (not just Scotland) would really see how much money it costs to run this poorly managed and unnecessary organisation.
But I don't suppose that will ever happen....