Zee, I retested the Kursk Pre Alpha v.1 several times now and happy to report Tiger Group not advancing in support of me is due to them getting shot up/knocked out.
I stayed with the group and saw they were immobilised but not destroyed.
I originally thought there was something possibly wrong with a waypoint or script but it is not so. What fooled me was that from a distance I have to look at the map to check on their progress as I split from the group to carry out a flank manouver, and they were showing up as being present, but not moving up as expected which of course was true but they didn't have any choice!!!
So there is nothing wrong except the opposition was too strong for them over the 4 or 5 times I played this mission to specifically look at the Tiger groups behaviour.
Over and Out Mort
