The cache is placed by an exclusive bit of green. This side of Skreen Road was developed first and the grassed area was laid out at the same time. It was fenced off as it was meant for the exclusive use of the owners of the houses in the crescent. They used it for lawn tennis. The opposite side of Skreen Road was built at a later date and a good friend of mine who lived approximately 50m away remembers people playing tennis in their whites when he was a kid. There is a gate into the park but it is always locked and only the residents of the crescent have access. My friend was never in there in all his childhood years. You can still see the old supports for the tennis nets.
The number 37 bus will drop you off on Skreen Road very close to GZ.
I believe this information is correct but feel free to put me straight if you know anything else.