Results from a comparative study of simulations and experiments on plasma profiles and anomalous transport in a simple, magnetised plasma torus is presented. Under typical operating conditions the cross-field discharge current is classical and determines a hollow potential profile. The particle transport is always anomalous and mediated by electrostatic flute-mode turbulence. There is a universal critical density scale length for onset of the interchange instability. The average density gradient is slightly subcritical, and the power spectra of the potential fluctuations have approximately a 1/f dependence. These features are characteristic for systems exhibiting self-organized critical behaviour.