The Campaign to Protect Rural England said in their report Ashford was an example of what other councils should aspire to, praising its commitment to making light pollution a serious issue.
http://www.ashfordherald.co.uk/ashford-officially-darkest-skies-kent/story-29395126-detail/story.html
The new CPRE light pollution map (on which the report is based) is very detailed:
http://nightblight.cpre.org.uk/maps/