Sometimes emails get miss-directed or the contact details have changed. The best way to obtain permission with Council Rangers is generally to make direct contact either by phone or in person. This approach seems to work best here in North Wales, and I've found the personal contact works wonders for getting help with the placement of other caches even if they only manage the land for someone else. Remember their job description is not just the management of the land but also the recreational use of it. Caching not only fits this but also gives them extra eyes keeping a lookout for any problems that might be present.
Dave.
My post is my personal opinion and as such you do not have my permission to quote me outside of these forums!
Dave
Brenin Tegeingl
Formerly known as Mancunian Pyrocacher on GC