  There is an $\approx9\pm2.5$\% tension between the value of Hubble's
Constant, $H_0=67.4\pm0.5$km\,s$^{-1}$Mpc$^{-1}$, implied by the {\it Planck}
microwave background power spectrum and that given by the distance scale of
$H_0=73.4\pm1.7$km\,s$^{-1}$Mpc$^{-1}$. But with a plausible assumption about a
{\it Gaia} DR2 parallax systematic offset, we find that {\it Gaia} parallax
distances of Milky Way Cepheid calibrators are $\approx12-15$\% longer than
previously estimated. Similarly, {\it Gaia} also implies $\approx4.7\pm1.7$\%
longer distances for 46 Cepheids than previous distances on the scale of Riess
et al. Then we show that the existence of an $\approx150$h$^{-1}$Mpc `Local
Hole' in the galaxy distribution implies an outflow of
$\approx500$km\,s$^{-1}$. Accounting for this in the recession velocities of
SNIa standard candles out to $z\approx0.15$ reduces $H_0$ by a further
$\approx1.8$\%. Combining the above two results would reduce the distance scale
$H_0$ estimate by $\approx7$\% from $H_0\approx73.4\pm1.7$ to
$\approx68.9\pm1.6$ km\,s$^{-1}$Mpc$^{-1}$, in reasonable agreement with the
{\it Planck} value. We conclude that the discrepancy between distance scale and
{\it Planck} $H_0$ measurements remains unconfirmed due to uncertainties caused
by {\it Gaia} systematics and an unexpectedly inhomogeneous local galaxy
distribution.
