On Sat, 04 Oct 2014 08:31:49 +0100, Brian Gaff wrote:

This no disc seems a strange way to proceed. If as we are all told,
there are many untaxed and uninsured people on the roads, a member of
the public could easily look at a vehicle and tell the authorities if it
was expired.
Now however how would anyone know?

A tax disc didn't tell you anything about whether a car was insured
anyway.