Doug
Firstly any Law that the Scottish or Uk paliment bring out can be removed, take the Poll Tax as an example, it was unpopular by the majority of the country and its was scrapped.
Next, by you making the councils attually work for the money for once, will only leave the cost of the licence fees being raised to cover their extra costs in enforcing them.
At the moment window cleaners in Scotland pay about £80 per year on average for 1 licence, what will they say to you and the SLWCN when they now have to pay £100 or £200 per licence, and with some having to have upto 7 licences, its one hell of a bill, especially if they have to pay for 3 years upfront.