Maratus Robinsoni (rainbow jumper) (see for colour changes)
i found this little (3mm) jumping spider next to a sandy track near Dudley in Newcastle, it was sitting on top of a Astroloma Pinifolium. I only saw a tiny flash of yellow as it moved !! Iv'e been back twice to find another, but couldn't find one ! This is the only one iv'e ever seen, and maybe the only one i or anyone else , ever will !! hope not.