Jubilee park nowadays is a peaceful place where you can walk through natural oak woodlands and through wide grassy areas.
If you walk up towards Petts Wood, you can spot second world war concrete trackways disappearing into the undergrowth in the woods, and the imprint of circular concrete platforms in the grass.
This was the site Thornet Wood Heavy Anti-Aircraft Gun Site, one of a defensive ring of gun sites encircling London during the Second World War: there were about 8 gun emplacements, and a small town of Nissan huts were the crews and support workers lived. They were manned by the 71st London Regiment and defended the capital from enemy bombers and V1 rockets.
More can be found out about Jubilee Country park, and the events there, at the the friends website for Jubilee Park.