1. Something occurred to me - memories from my days of food inspection. The issue is uncertainty … if you are supplying goods to a fixed volume contract, and relying on imports from a third country, you may find that it becomes impossible to guarantee deliveries.

2. Say you have 20 loads a month, 19 might go through with no problems at all. And then one, for no apparent reason, might be stopped for inspection at the port and held up. As well as the cost, you then have a shortfall which has to be made up.