New Milton War Memorial is a central icon in the recreation ground. For those interested in the history surrounding the memorial, I'm sure this website will do a better job of explaining it than I could do: https://www.iwm.org.uk/memorials/item/memorial/48937 .
The given coordinates should take you to the memorial itself, not the physical cache.
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200? - IRAQ = A
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200? - SIERRA LEONE = B
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196? - ADEN = C
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19?0 - KOREA = D
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194? - PALESTINE = E
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199? - KUWAIT = F
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Final location: N50 45.ABC W01 39.DEF
Both the given location and the final coordinates are high muggle areas so please be stealthy, at the final you may have to wait for people to pass and I wouldn't recommend doing this cache during 'school run' sort of times because there is a lot of foot traffic. You have been warned!