SneakyCuttlefish
I think the plant above is Mammillaria polythele fma durispina, I bought a triple header of these plants at a Bunnings warehouse that was unlabelled.
This plant is very variable, but fma durispina has six radial spines, with the largest one being curved upwards and another large one being curved slightly downwards.
http://mammillarias.net/gallery/mammillaria_species.php?searchstring=durispina&lg=uk