When I was at school, every summer we played a game that was NOT CRICKET. Now my daughters do the same. While the boys are playing cricket, they are playing NOT CRICKET. Perhaps at more enlightened schools the games aren't split so clearly along gender lines, but it's still true that overall, NOT CRICKET is a game mostly played by girls in the summer term.
NOT CRICKET is credited with being the inspiration for a very popular game in the USA, but most people in the USA have never heard of NOT CRICKET.
NOT CRICKET shares some similarities with cricket, but crucially it is NOT CRICKET. If you're not sure what game I'm referring to, ask the (British) women in your life what game they played every summer while the boys were playing cricket.
The cache is not at the posted coordinates, because then you'd be right in the middle of a game of cricket (but never NOT CRICKET, which is not played here). To find it you'll need to learn a little more about NOT CRICKET.
No more than A players can be on the field at any time
The distance between the first and second post should be BCm
The minimum number of players on a team is D
The distance between the third and fourth post should be E.Fm
The total number of posts is G
The cache can be found at:
N51 29. E-(D+C) D+B A
W000 17.B G F-(G+B)
Placed with kind permission of London Borough of Richmond upon Thames