I've been planning something like this for ages and suddenly had the inspiration to make it happen. You must first solve a two-part puzzle to gather information which will help you find and access the cache itself.
1) Find the cache location by solving this puzzle:
MLK XXXA Abe L XXXB John Lennon XXXC Spencer Perceval XXXD Publius Septimus Geta EFF N53 12.(B-1)(B)(A-D) W000 34.(B+F)(E)(B+C+E)
You can check the coordinates here:
You can check your co-ordinates for this puzzle on GeoChecker.com.
2) Before heading to the cache location solve this final puzzle and take the answer with you. There is no point in going without this information!
When did the Big Fellah pass away? GGHHII
You can check this part by using this link:

You can validate your puzzle solution with certitude.
If you are correct you will also receive further instructions.
3) Please be very careful not to be watched while you do this and please leave the cache, secure and exactly as you found it. Any comments or suggestions are very welcome. Retrieving this cache will take you a few minutes and may require patience and dexterity. Please allow for this when avoiding attention. Good luck!
