
In many organisations, customs processes are managed day to day within supply chain or logistics. For an Operations Director, it’s easy to assume these tasks are well in hand especially if the team has been doing them for years without incident.
But what if those processes aren’t as robust as they appear? What if the people managing them don’t have the specialist skills or experience to recognise where the real compliance gaps are?
This isn’t about poor performance. It’s about a recognised cognitive bias. In 1999, David Dunning and Justin Kruger identified what became known as the Dunning-Kruger Effect, a tendency for those with low ability in a given area to overestimate their competence.
“People tend to hold overly favourable views of their abilities in many social and intellectual domains.”

Citation: Dunning, D., & Kruger, J. (1999). Unskilled and unaware of it: How difficulties in recognising one’s own incompetence lead to inflated self-assessments. Journal of Personality and Social Psychology, 77(6), 1121–1134.
In customs, this can mean that operational teams feel confident their work is fully compliant, not because it is, but because they lack the technical insight to see the flaws.
Overconfidence can create a culture where processes go unchallenged and external review is resisted. Sometimes this is about protecting ownership of the work, but often it’s simply because the team believes there is nothing to find.
Phrases like “we’ve always done it this way” or “this is how our broker told us to do it” can conceal significant operational weaknesses, including:
These aren’t just administrative issues. They can lead to costly delays, rework, or full-blown customs investigations.
Customs requirements are evolving fast. Post-Brexit changes, new trade agreements, and HMRC’s increased use of data-led auditing mean the landscape is far less forgiving.
For Operations Directors, the risks include:

An external customs audit isn’t about undermining your team; it’s about providing an extra layer of assurance that the processes in place are fit for today’s trading environment.
Independent reviews can:
It’s a way to strengthen your operation, not criticise it.
In customs, confidence without capability can create unseen vulnerabilities. For operations leaders, the key is not to assume that “no news is good news,” but to make sure your team’s confidence is backed by proven competence.
The Dunning-Kruger Effect reminds us that without the right expertise, even the best-intentioned teams can miss critical risks. And in operations, the cost of those blind spots is felt across the entire supply chain.