It seems unlikely that even in the worst case, stuff would be stuck at the Dover Calais border for that long, so I don't think supply will be anywhere near as badly affected as people think.
I hope to god you are right in that but we don't know what major disruptions may in fact take place so a refrigeration lorry in the worst case scenario could keep it's engine running in order to maintain temperature control for up to two weeks on a full tank multiply that by how many lorries sitting with engine running for how long as is necessary and now if you would please calculate the rise in air pollution due to the release of particulates by said lorries.
1 August 2018
The government has proposed turning the M20 into a giant lorry park as a “temporary solution” to trade border congestion caused by a no-deal Brexit.
An impact assessment by Dover District Council, released under freedom of information law, reveals that a 13-mile coast-bound stretch of the motorway will be “earmarked” to be turned into a 2,000-vehicle lorry park.
It said the plan “needs to be delivered” before changes to customs arrangements in March 2019, but the start date for road works has not been announced. “There does not appear to be a Plan B,” the report said.
Called Operation Brock, the park is described as an “interim plan”. Nevertheless, the report predicts it will be “many years” before a permanent solution is found, and says that Highways England will spend £25m on the operation.
The current transport infrastructure, it added, is “insufficient to respond to changing border arrangements”, with the number of HGVs passing through expected to increase by 43% by 2030, to 3.8m using Dover each year.
The document also predicts that Border Inspection Posts (BIP), required for the inspection of food imports and exports, would need to be installed at Dover port and the Channel Tunnel.
Last month, a London School of Economics report found that every seven extra minutes of port check times would add 10 hours to transportation times
And that is concerning food items checks may be different for medical supplies may be quicker but I suspect not.
https://www.cips.org/en-GB/supply-m...otorway-to-become-giant-temporary-lorry-park/
I had this conversation with a friend who is insulin dependent and an ardent brexiteer over 12 months ago I feel no easier in my mind over this vexing problem now than I did then.