When a party relies on legal advice in an action, and especially where their former counsel files an affidavit in support, how much of that privilege will be lost?

At para. 21 of Iozzo v. Weir, Slatter J. stated: When a party relies on legal advice in an action, and especially where his or her former counsel files an affidavit in support, the litigant is not entitled to decide unilaterally how much of the privilege will be lost. Mere reliance on legal advice does not negate the entire privilege, and does not give the other side access to all communications between the solicitor and the client. However, privilege is lost over any communication that has a relevant and material connection to the issue being brought forward.