So are there circumstances where you either appoint a coy or another trust as the shareholders of the Trustee Coy to add the extra level of protection in the event of fault/negligence at the property in question. Or does the level of blame always follow through (ie if a Trust were the only shareholder of a Trustee Coy then the Trustee of that coy (whether personal or coy shareholders) would be responsible.
I think you misunderstood. Shareholder can't be liable for the actions of the company.
But the people who may be shareholders do other things such as be directors or perform work at the property and they could potentially be sued because of this.