The Chinese Pagoda
China opened to the west during Queen Victoria's reign and in 1842 the original Chinese Pagoda was built as an entrance to the Chinese Exhibit in the London Parks.
After the exhibition, the Pagoda was purchased for display in Victoria Park. The two story Pagoda stood on an island in the center of one of the parks lakes but suffered considerable damage during World War II. Over the years it fell into disrepair and was eventually demolished in 1956.
In 2010 the Borough was awarded a £4.5m grant towards a programme of major improvements to Victoria Park. The funds were used to restore the landscape and a new Pagoda was introduced.
The new Pagoda is built on the original location in Victoria Park and features a new bridge.
The Co-ordinates
The cache is not at the published co-ordinates, you will need to find the answers to the following questions to solve the co-ordinates and find the cache.
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The date the original Chinese Summerhouse was sold to Victoria Park. ABCD
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The number of gold balls on the ornate bridge leading to the pagoda E
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Inside the pagoda look up and count the number of green squares on the ceiling. FG
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The number of the CCTV camera outside the pagoda. HIJ
N 51° (C-A)H.GCA W 000° GF.(J-H)IE
The Cache
You are looking for a magnetic nano.
Please sign the log book and replace back in the same location out of sight. Take care when retrieving this cache not to damage your surroundings.
With thanks to Joelle Copeland from the Parks and Open Spaces Department and Victoria Park for allowing us to place this cache.
You can check your solution here:

You can validate your puzzle solution with certitude.