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Sidymella longipes
About 30mm across.
On brick school wall at night under strong lights.
Family Thomisidae. Crab spiders. Variations - http://www.arachne.org.au/01_cms/details... Range - http://bie.ala.org.au/species/Sidymella+...
No that's perfect thanks Stephen. 30mm was the span across outstretched front legs. 5mm for the body looks about right. I'll go with that one.