I found your coin on a very wet and windy day in Mosman park, Weather not unlike what you would expect from the Brecon Beacons! 🙂
The cache I retrieved it from is very near to where I work, but I never realised that there was a whole network of world war 2 tunnels and gun enplacements here!
THE LEIGHTON BATTERY , BUCKLAND HILL, looks really interesting, http://www.artillerywa.org.au/RAAHS/Leighton.htm
I'll be coming back here for a look around when the weather's better.
Many thanks, I'll move your coin on soon.
SpoonZ