As its legal advice to council, and the council have not seen it, then the council cannot be aware of it. If the clerk is interpreting what the advice is and forwarding it to council, that just their opinion, and carries no weight. If the council is taking decisions (and voting) based on unseen advice, then all those decisions can be challenged. As noted below, do not be brow beaten, just carry on working the issue, and, if you can, get members of the public to ask about it at every parish council meeting - minuted as well.