Glad you like to furtle!!!
The problem with the site is that its a highly protected Oxford University scientfic area but with stupendous views over the city. Access is only gained by a pass, although I have only once been asked...first time there as it happened. I would not want to spoil the place but the idea of getting the committed cache hunter in appeals. It is also locked up after sunset so those who hunt in the dark could not gain access.
I also note the word micro in one of the replys, what is meant by this?