Radial velocities for J150822 (crosses indicate primary component, squares secondary) with preliminary fits (solid curves) used to obtain correct phasing of observations. Also shown are a light curve obtained from the spectra themselves (grey diamonds, fitted with dotted grey curve) and the predictions for time of minimum light from SuperWASP ephemerides (the solid vertical line indicates a linear ephemeris, i.e. no period change, the dotted vertical line a quadratic one, i.e. secular period change; the two are almost coincident).