A comparison is presented of measured and simulated parallel flows in the low field side scrape-off layer of MAST Ohmic shots. Simulations with the B2SOLPS5.0 code reproduce the experimentally observed co-current rotation direction. The absolute values of the simulated Mach number are smaller than those of the measured ones; the difference might reach a factor of two. It is demonstrated that in both the simulations and the experiment the parallel velocity increases with temperature and decreases with poloidal magnetic field.