At the cache location is an exact scale, fully operational reconstruction of Sir Francis Drake's Square rigged galleon which sailed round the world 1577-80. You do not have to enter the museum to answer the question, which is located in the vicinity.
Question: The parishioners of which Parish, were entitled to land goods here free of charge?
It's probably not the church you are thinking of, or the other one. So don't try and guess the answer. You will need to find the sign.
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The nearest train/tube station is London Bridge.
This is my first cache, so any feedback would be appreciated.