Atheist, am not sure why postal votes "disenfranchise undesirables (lefties, low-life, poor, non-white skin etc.) "
Ive used them only when I been abroad on holiday at election time .... does that mean I'm a leftie, a low life, poor or non-white.
I never seen anyone turned away from a local polling station due to skin colour. The poor and nonwhites can find ID when it comes to claiming benefits or using a bank or driving a car so why not for voting??