I’ll just add a bit more to that top point.
There are 4 major sea ports on the U.K.; Felixstowe, Southampton, London Gateway and Liverpool. All these Ports have infrastructure (for Border Controls and SPS checks) in place. The transition will be hard for these.
Liverpool for example, currently handles around 2.5k consignments of RoW traffic in a given year, so naturally has the staffing structure in place. Come July 2021 they’ll be dealing 25k consignments. Plus any spill over from other ports.
on top of that, places like Portsmouth, Hull, Holyhead, East Midlands Airport, Eurotunnel in Kent, Dover and a host of other Ports of Entry are going to see a large amount of EU consignments landing at their door. These authorities have no experience of dealing with SPS checks, none whatsoever; and now have 6 months to fully staff up, get the port operator to find space and build facilities and prepare for something they’ve never done before
There’s a complete lack of qualified staff, no Veterinary Surgeons (because they all went back to their native EU homes) and a total lack of understanding on how Local Authorities and SPS check regime operate.
Im still raising issues with government, that I raised 3 years ago when planning for Brexit, that are still outstanding