<nav class="navigation">
  <ul>
  	<li><a href="{{ url_for('.organisation_dashboard', org_id=current_org.id) }}" {{ org_navigation.is_selected('dashboard') }}>Services</a></li>
    <li><a href="{{ url_for('.manage_org_users', org_id=current_org.id) }}" {{ org_navigation.is_selected('team-members') }}>Team members</a></li>
    <li><a href="{{ url_for('.organisation_settings', org_id=current_org.id) }}" {{ org_navigation.is_selected('settings') }}>Settings</a></li>
    {% if current_user.platform_admin %}
    <li><a href="{{ url_for('.organisation_trial_mode_services', org_id=current_org.id) }}" {{ org_navigation.is_selected('trial-services') }}>Trial services</a></li>
    {% endif %}
  </ul>
</nav>

<nav class="navigation">
  <ul>
  	<li><a href="{{ url_for('.organisation_dashboard', org_id=current_org.id) }}" {{ org_navigation.is_selected('dashboard') }}>Services</a></li>
    <li><a href="{{ url_for('.manage_org_users', org_id=current_org.id) }}" {{ org_navigation.is_selected('team-members') }}>Team members</a></li>
    {% if current_user.platform_admin %}
    <li><a href="{{ url_for('.organisation_settings', org_id=current_org.id) }}" {{ org_navigation.is_selected('settings') }}>Settings</a></li>
    <li><a href="{{ url_for('.organisation_trial_mode_services', org_id=current_org.id) }}" {{ org_navigation.is_selected('trial-services') }}>Trial services</a></li>
    {% endif %}
  </ul>
</nav>

Make settings link platform admin only
Make settings link platform admin only
