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Geoff, I'd say Katoomba Airstrip is a 3.5 on the Bortle scale. Aside from the east (washed out badly by Sydney), overhead and to the west, clouds are dark but the zodiacal light is not easily discernable. On a really clear night after a thunderstorm it could make a good 3, but I haven't been so lucky there.
A bit further west, Hargraves lookout on Shipley Plateau IMHO is easily a good 3, possibly a 2 on some nights; the zodiacal light is easily seen there. Clouds are just black holes and on the western horizon you can see airglow. But the east is no better than 4 or 5 for the same reason as the airstrip.
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