EU: Police and Criminal Justice Measures

My Lords, I am sorry to interrupt my noble friend, but while he is talking about process and procedure can he perhaps explain to me, if to no one else, the following? In the debate in the other place, my right honourable friend the Home Secretary said that the mandate that she was seeking that evening would lead to the UK exercising the opt-out. Precisely when is it envisaged that we will give formal notice to the Council of our intention? Is it to be after we have passed, if we do, the Motion tonight or will it be after there has been consideration of the reports by the relevant committees?