If you have to check every vehicle that currently enters the country fairly seamlessly using a CMR you can make a fairly accurate estimation of how much delay that is going to create.
If we import certain amount of goods from a certain country under the terms of a trade deal that we will now need to pay WTO tariffs on the you can make a fairly accurate estimation of what the extra cost will be and vice versa with exports.
Yes, all these models can't be relied on 100% but it's not like they're based on guess work.
I agree about resourcefulness and it looks like we could be relying quite heavily on it.
The UK resourcefulness was to help create the SM and CU to make up for us being on an island and the extra time and costs incurred because of that. Now we have a government that, on paper, is determined to bash that in order to stop the reciprocal FOM it involves. The UK will be working on a way to get back as near as possible to the SM and CU for the same reasons it helped create it for in the first place. We will not become a Singapore because we don’t have the location advantages they have, and if we open the floodgates to the US economy, we will wreck our economy. At the end of the day geography and common sense will kick in.