Boris Johnson, introduced Tier 4 restrictions for 17 million people in London and parts of the Home Counties from midnight on Saturday, which saw all but non-essential shops close and people being told not to travel for Christmas.Get the latest updates from across Greater Manchester direct to your inbox with the free MEN newsletterYou can sign up very simply by following the instructions hereThe French ports were shut after the Tier 4 measures were introduced as a new highly-transmissible