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We present a new measurement of $E_{\rm G}$, which combines measurements ofweak gravitational lensing, real-space galaxy clustering and redshift spacedistortions. This statistic was proposed as a consistency test of GeneralRelativity (GR) that is insensitive to linear, deterministic galaxy bias andthe matter clustering amplitude. We combine deep imaging data from KiDS withoverlapping spectroscopy from 2dFLenS, BOSS DR12 and GAMA and find $E_{\rmG}(\overline{z}=0.267)=0.43 \pm 0.13$ (GAMA), $E_{\rmG}(\overline{z}=0.305)=0.27 \pm 0.08$ (LOWZ+2dFLOZ) and $E_{\rmG}(\overline{z}=0.554)=0.26 \pm 0.07$ (CMASS+2dFHIZ). We demonstrate that theexisting tension in the value of the matter density parameter hinders therobustness of this statistic as solely a test of GR. We find that our $E_{\rmG}$ measurements, as well as existing ones in the literature, favour a lowermatter density cosmology than the Cosmic Microwave Background. For a flat$\Lambda$CDM Universe and assuming GR, we find $\Omega_{\rmm}(z=0)=0.25\pm0.03$. With this paper we publicly release the 2dFLenS datasetat: \url{http://2dflens.swin.edu.au}.

KiDS+2dFLenS+GAMA: Testing the cosmological model with the $E_{\rm G}$ statistic