See, we're back to this Martin Rose thing again. I still don't get why everybody who hated him didn't just vote him off the Trust. An EGM or similar would have taken care of that. It sounds like a case of people preferring to moan than actually do something about it.
On the share front, it's nothing to do with number of members. If the Trust wants shares they have to buy them in sufficient numbers to get appropriate representation. However, if its a well run Trust, they can have influence over the board without voting rights.