If Peggy Mitchell does secure election to Walford Council on her platform of opposition to massage parlours, then she will come up against something called "the pre-determination rules", under which, since she has ever expressed on opinion on the subject, she will be permitted no part in deciding anything about it. Seriously.
Deidre Barlow was on Weatherfield Council at one time. She then became an Officer there. She knew where the real power lay.