Chewbacca, in regard to your post @17:36 today, Headley made the offending statement(s) on his own Facebook page which has no direct connection with the RMT union.
Therefore it would seem that the only disciplinary allegation that can be brought against Headley would be one of "bringing the RMT union into disrepute. However, Headley would have had to made reference to the RMT and his role within it on that page in the last few weeks for there to be any chance of making the above allegation hold good in any disciplinary hearing.
My feeling is that there may be underlying issues in this matter over and above what is being stated on the surface. Headley must have been aware of the trouble he would cause for himself when he posted those words.
The RMT union has looked somewhat unstable in its structure since the sudden death of its almost legendary leader Bob Crow.