If you move goods in or out of the UK, you will know how stressful customs clearance can be. One hold-up at the port and suddenly production lines slow down, customers are waiting, and phones start ringing. Customs delays are not just a paperwork issue. They can mean storage charges, missed delivery slots and unhappy clients further down the chain.
Across the UK, from container traffic at Felixstowe to ro-ro movements through Dover, we see the same themes cropping up time and again. Most shipment delays are avoidable with the right preparation and a clear understanding of UK customs clearance processes. Below are the ten most common reasons goods get held at the border, and what you can do about them.
1. Incorrect or Incomplete Documentation
By far the most common cause of customs delays is simple paperwork errors. Missing commercial invoices, unsigned declarations or incorrect consignee details can all trigger a hold.
Typical issues include:
- Invoices without full company details
- Weights that do not match the packing list
- Incorrect incoterms
- Missing licences or certificates
Even small discrepancies between your import documentation and export documentation can create questions. Customs officers are looking for clarity and consistency. If something does not add up, the shipment is paused while it is investigated.
A simple internal checklist before goods leave the warehouse can prevent days of shipping delays at ports.
2. Missing or Incorrect Commodity Codes
Your commodity code, sometimes called the HS code, determines duty rates and whether any restrictions apply. Get it wrong and you risk underpaying duty or triggering an inspection.
We often hear, “We have always used this code.” That may be the case, but codes change and product specifications evolve. Something as minor as adding a battery to a product can shift it into a different classification.
Accurate classification is central to customs compliance. If HMRC disagrees with your code, expect delays while the goods are reviewed and potentially reclassified.
3. Unpaid Duties and VAT
If duties or VAT are not settled correctly, goods will not be released. This can happen if a deferment account is not set up properly or has reached its limit.
Cash flow planning is part of smooth freight forwarding UK operations. Make sure you understand what is due and when. A missed payment can leave a container sitting at the port, clocking up storage and demurrage charges by the day.
4. Random Customs Inspections
Not every delay is down to an error. Some shipments are selected for random inspection. Others are flagged due to the type of goods or their origin.
While you cannot prevent a random check, you can prepare for it. Clear labelling, organised pallets and easily accessible cartons make inspections quicker. We have seen officers reseal loads the same morning because everything was laid out logically and documents were in order.
5. Inaccurate Goods Valuation
Declaring the correct value is essential. Under-declaring to reduce duty is a serious offence and often spotted. Over-declaring can also raise questions.
The declared value should reflect the true transaction value including assists, royalties or additional costs where applicable. If HMRC suspects inaccuracies, they may request supporting documents which leads to shipment delays and extra scrutiny on future consignments.
6. Restricted or Prohibited Goods
Some goods require licences. Others are restricted outright. This applies to certain chemicals, food products, animal products and dual-use items among many others.
We regularly get calls from businesses who assumed their supplier had sorted the necessary paperwork. Responsibility ultimately sits with the importer or exporter. Without the right pre-notifications or health certificates, shipments can be held or even refused entry.
Checking the rules before the goods are dispatched avoids uncomfortable conversations later.
7. EORI Number Issues
Your Economic Operator Registration and Identification number is fundamental to UK customs clearance. Without a valid EORI, goods cannot be cleared.
Problems arise where:
- The EORI is not linked correctly to the VAT number
- Details do not match HMRC records
- The number has simply not been provided on the declaration
It sounds basic, but these errors cause daily customs delays. Always double-check that your EORI is active and correctly recorded on all paperwork.
8. Poor Packaging or Labelling
Customs officers and port operators need to identify goods quickly. Poor or unclear labelling makes inspections slower and increases the likelihood of deeper checks.
For example, if cartons are marked generically as “parts” rather than a clear product description that matches the invoice, questions will follow. Hazardous goods in particular must meet strict packaging and marking standards.
Good packaging protects not only the goods but also your timeline.
9. Inconsistent Shipping Information
When the bill of lading, invoice and packing list all show slightly different weights or product descriptions, alarm bells ring. Systems are designed to pick up these inconsistencies automatically.
Even spelling variations in company names can cause issues if they do not match registered details. Aligning all documentation before submission is one of the simplest ways to reduce shipping delays at ports.
10. Port Congestion and External Disruptions
Not all port delays UK are document-related. High traffic volumes, adverse weather and industrial action can all slow things down.
During peak trading periods it is not unusual for containers to wait longer for unloading slots. Road congestion around ports can add further time before goods even reach the customs stage. While these factors may be outside your control, forward planning and realistic lead times make a big difference.
How MartinTrux Helps Prevent Customs Delays
Preventing customs delays is about being proactive rather than reactive. Experienced freight forwarding UK teams review documentation before goods reach the border. They sense-check commodity codes, confirm duty calculations and ensure import documentation and export documentation align.
Equally important is ongoing communication. When shipping schedules change or regulations are updated, businesses need clear advice not jargon. Reliable customs support means fewer surprises and smoother movement through UK customs clearance.
Conclusion: Plan Ahead for Smoother UK Customs Clearance
Whether your goods move through Dover, Felixstowe, Harwich, Immingham, Killingholme, London Gateway, Portsmouth, Southampton or Tilbury, the principles are the same. Accurate documents, correct classification, settled duties and strong customs compliance processes keep freight moving.
Most shipment delays are preventable with the right guidance and attention to detail. Working with a knowledgeable partner like MartinTrux and benefiting from practical MartinTrux customs support gives UK importers and exporters confidence that their goods will move efficiently, even when pressure on the ports increases.
Contact MartinTrux for expert support with customs clearance and reliable freight solutions.