It is well worth noting that there isn't a ban on flying flags.

What Birmingham council set out to do was obtain an injunction against putting flags on council owned infrastructure. The council also set out to prevent obstruction of the highways whilst hanging flags up, to prevent interference or harassment of council officers, contractors, and members of the public. Various people have since given undertakings to not do such things. It's worth looking into their backgrounds, too.

Your correspondent Sylvia Foreman was either unaware of these issues that the council is trying to protect against, or simply omitted to mention them to attempt to strike an emotional point. I'm sure it's the former.