I cannot comment on the tactics employed that you have witnessed, but parking enforcement is a necessary evil in Dickens Heath. prior to the restrictions it was a free for all.
You may not be aware, but you are actually able to contact Solihull Parking services to request a parking permit which allows tradesmen to park for the duration of their work. I have obtained permits on behalf of tradesmen working in my property.
There is no cost for the permits.
Parking services: 0121 704 6111