This multi cache is a cache within a cache! To find the Cave of Wonders you must first complete GC320ZY- Open Sesame, the UK's biggest geocache! This opencache is inside it!
Once you have completed Open Sesame and gained access to this wondrous location, you will have to look inside to find a padlocked blue box.
Next you will have to find the codeword to open the padlock! That's right, it's a word, not a number!
Use your smartphone to read the QR code on the box. This will give you a question to answer. The answer is the word you will need to open the box! (Google may help you here!)
Once inside, sign the logbook in the usual way and help yourself to something from inside. There are back issues of PinPoint magazine, some business cards and some spare caches to take and use. One item per cacher please!
There is also a travelbug attached to the inside of the cover. Twist it round to read the tracking number and then twist it back round before closing. There's also a munzee sticker!