Has anyone had specific involvement in obtaining permission to cache from a local council, in particular how long did it take?

I want to place a cache (or 2) on Epsom Common, Surrey. There is a cache on Ashtead Common, which is adjoining, but the 2 appear to be entirely seperate.

I've e-mailed the Ranger's office, but wondered how long I should wait to chase (it's only been a week so far and I realise councils are notouriously slow&#33