No, not an unusual Australian sport. This is a Great Green Bush Cricket. Just to prove that we have some large insects in the UK.
A little over 50 mm without its tail!
But it was amongst the foliage so I really struggled to find a reasonable camera angle. This angle works for identification even if it isn't the most aesthetically pleasing.
This cricket is a final stage nymph which has a tail (ovipositor) but hasn't quite fully grown its wings yet.