  It is well established that late-type main-sequence stars display a
relationship between X-ray activity and the Rossby number, $Ro$, the ratio of
rotation period to the convective turnover time. This manifests itself as a
saturated regime (where X-ray activity is constant) and an unsaturated regime
(where X-ray activity anti-correlates with the Rossby number). However, this
relationship breaks down for the fastest rotators. We cross-correlated
SuperWASP visually classified photometric light curves and ASAS-SN
automatically classified photometric light curves with XMM-Newton X-ray
observations to identify 3,178 stars displaying a photometrically defined
rotational modulation in their light curve and corresponding X-ray
observations. We fitted a power-law to characterise the rotation-activity
relation of 900 main-sequence stars. We identified that automatically
classified rotationally modulated light curves are not as reliable as visually
classified light curves for this work. We found a power-law index in the
unsaturated regime of G- to M-type stars of $\beta=-1.84\pm0.18$ for the
SuperWASP catalogue, in line with the canonical value of $\beta=-2$. We find
evidence of supersaturation in the fastest rotating K-type stars, with a
power-law index of $\beta_{s}=1.42\pm0.26$.
