Terry there are some here that have not heard about your surveying days in the remote parts of our great land. I'd too like to hear them again.
When we moved to Menai 30 years ago our lawn was practically all couch which I disliked , but rather than kill it or pull it up I kept it. Over the years I have added patches of buffalo which I consider the more robust grass, greener and looks better. Today all my front and back lawns are now buffalo. Almost all, but as you know couch is a tuff grass and it keeps trying to infiltrate. I regard it now as a weed and pull up the runners by hand. So mate we have been doing the opposite with our lawns for past three decades.