Just a small point re the roads/ports coming to a standstill.
The M20 (main route from Dover) is currently undergoing major roadworks, with a speed limit of 50mph from south of Ashford to north of Maidstone - a distance of about 30miles. This is already causing hideous delays, and is due to carry on til 2020.
The M2 (the other route from Dover) is knackered.
The M26, which joins the M20 to the M25 if you want to go west, is to be turned into a lorry park to cope with the inevitable delays caused by increased checks at Dover and other ports.
Chuck in the Dartford crossing, which is always clogged, and you have the perfect storm of lorries going nowhere - carrying the food Leavers want in their shops, the clothes they want to buy, yes the medications everyone needs.
This will happen. Operation Stack, when they use the M20 to store lorries when there are problems with the channel crossings, brings the whole county to a standstill regularly.