I've noticed a few press articles recently about the spread of these zones where door knockers are being clamped down on, mainly to prevent old ladies having their life savings taken off them by unscrupulous tradesmen.
The overall reaction has been very positive with Local Authorities reporting significant decreases in doorstep crimes.
http://www.timesonline.co.uk/tol/news/uk/article2289189.ece
A poster on the above article wondered if he could start getting JW's arrested? Google 'Jehovah no cold calling zone' and you can see the rest.
Have any active JW's come across this in their area and how is it being handled?