Kimberlin - As one who sometimes gets involved in the Political Side of Local Government I beg to remind you that Yes! rules must be enforced evenly and without bias.There is some argument that home office circular 13/2000 lays down the rules on this.
Secondly. The courts have already laid down the fact that a local authority can not use statutary licensing as a means of collecting revenue. Thay can recover costs - that is all.
Gareth