Jan first isnt it?
In a no deal scenario imports and exports get 20% slapped on.
A truck with food products needs a permit of transit per food type.
Every truck will need to go through full inspection (current rate is 1 in 50) causing backlogs in kent and delays in calais
Any live animal transport will need vet sign off, this is for food only, no pets for travel will be allowed
Trucks that normally do three or four drop offs on the continent will only be allowed single set down and return
The ability to import and export electricity via the single market expires including the ability to buy discounted wholesale prices on gas and oil
Access to europol or raising arrest warrents in europe goes from a day to six months
Access to european criminal databases ends
If things go really bad (ie the uk doesnt uphold the Northern Ireland part of the withdrawal agreement), pilots wont be insured to land in eu airports, the flights themselves cannot cross eu airspace
Access to euratom is ended which is the only supplier of the radio isotope for ct/MRI machines
Some financial services will immediately lose access, but not the clearing houses this being the card the uk has to play over the EU. It will take between 5 and 10 years but all Euro currency clearing will move back within the EU.
Rights of citizens living abroad end including their insurance and healthcare though countries are expected to allow people to nationalise and take up the countries passport.
Drivers licences wont be recognised, annoying for traveling, detrimental to delivery truck drivers
Access to the european gps may end right away or be staged, if right away location services turn off.
Permits of transport of chemicals for textiles under the echa ends which would affect manufacturing
There's probably more but I cant think of it.
Most things can be overcome but will cost business, the big difficulty is the 4-5 hour transit of goods becoming a 24 hour full red tape nightmare which could reduce the availability of some goods for consumers on the shelves
