This insect was walking on a brick wall, but slowly enough to allow a couple of photographs. It and the subject of Photo 3 were initially very close to each other, perhaps coincidental rather than connected. However, the subject of Photo 3 was more skittish and allowed only the one photo.
Thanks Kim. Most educational since this was quite different to my concept of katydids. Image 3 is now at https://canberra.naturemapr.org/Community/Sightings/Details/4204302.