Three mistakes most often hold up PL-UK transport: a vague description of goods on the invoice, a late or missing ENS and no proof of origin. Below we explain how to prevent each one.
Contents
Every haulier and exporter on the Poland-UK route has run into a border delay caused by document problems. In this article we cover the three most common documentation mistakes that cause goods to be held — and how to avoid them, so transport runs smoothly and without costly hold-ups.
Why is PL-UK customs documentation so demanding?
Since 1 January 2021, goods moving between Poland and the United Kingdom have been subject to full customs procedures. This means mandatory export declarations on the Polish side, import declarations on the British side, and the ENS and GMR security systems. Each of these layers requires precise data. A single error in a single document can delay an entire shipment.
Mistake 1: Incorrect description of goods on the invoice
Generic descriptions of goods — such as "industrial articles", "spare parts" or "miscellaneous goods" — are one of the biggest problems in export documents. UK HMRC and the Polish National Revenue Administration (KAS) require the invoice description to be detailed enough to correctly assign an HS (tariff) code. A description that is too general leads to:
- Queries from the customs authority and a hold on clearance
- The need to provide additional explanations or specifications
- In extreme cases — detention and physical inspection of the goods
How to avoid it: On the invoice, state the full trade name, material composition or function of the goods, together with the correct HS code. If you're not sure of the code, check the UK Trade Tariff (see also: how to find the right HS code) or consult a customs agency. The other invoice fields are covered in The commercial invoice for the UK – 8 mistakes.
Mistake 2: A late or missing ENS declaration
The ENS (Entry Summary Declaration) is a safety and security declaration submitted to HMRC through the Safety and Security GB (S&S GB) service — by the carrier, or on its behalf, e.g. by a customs agent — before the goods arrive in Great Britain (gov.uk — Making an entry summary declaration). HMRC minimum time limits: RoRo (ferries, accompanied and unaccompanied) — 2 hours before arrival; Channel Tunnel — 1 hour before arrival at the Eurotunnel terminal in Coquelles (gov.uk — ENS time limits).
The most common ENS problems are:
- Submission after the vehicle has already left Poland
- Incorrect vehicle or trailer registration number
- Failure to link the declaration to the correct port unit (GVMS)
The result? The driver arrives at the port without a valid GMR (Goods Movement Reference) and is refused boarding onto the ferry or entry to the terminal. The delay, ferry rebooking and driver downtime all add extra costs to the job.
How to avoid it: The ENS should be submitted at the latest when the goods are loaded, not en route. Many logistics companies hand this task to an external customs agency that monitors deadlines and data accuracy. The differences between the systems are explained in Safety and Security GB vs ICS2, and you can check a GMR's status with our guide How to check GMR status in GVMS.
Mistake 3: Missing or incorrect proof of origin
The Trade and Cooperation Agreement (TCA) between the UK and the EU allows 0% UK import duty on goods originating in the EU under the TCA rules of origin — but only with proof of origin. The proof is a statement on origin made out by the exporter, or the importer's knowledge; the EUR.1 certificate is not used under the TCA. An EU exporter making out a statement for a consignment worth more than EUR 6,000 must include their REX number. Without proof of origin, the importer pays full duty (gov.uk — Proving originating status).
Typical mistakes include:
- A missing statement of origin on the export invoice
- A statement on origin made out for goods that do not meet the TCA rules of origin (buying goods in the EU does not make them EU-originating)
- A missing or incorrect exporter REX number on the statement (consignments over EUR 6,000)
The consequences can be deferred — HMRC can verify origin after import and demand the duty that should have been paid.
How to avoid it: Before the first shipment of new products to the UK, verify the rules of origin applicable to the goods' HS code. Prepare a standard statement template for regular suppliers. The rules for making out the statement and the REX number are explained in Statement on origin and the REX system.
Full PL-UK customs document checklist
If you want to make sure your transport is fully documented before departure, the full PL-UK customs document checklist on easyclearance.pl contains a complete list of documents broken down by export, import, ENS/SSD and transport documents. The checklist is updated on an ongoing basis in line with changes to HMRC rules.
Summary
The three main causes of delays at the PL-UK border are: imprecise invoices, a late ENS, and gaps in proof-of-origin documents. Each of these mistakes can be avoided with the right knowledge and good cooperation with a customs agency. Regularly reviewing your procedures — especially with new products or new trading partners — is the best investment in the smooth running of international transport.
Article prepared by the AgencjaCelna.uk team. Updated: October 2026.
Have goods about to leave for the UK? Get in touch with us – we will check the documents before clearance.
Frequently asked questions
What description of goods on the invoice is enough for clearance into the UK?
The description should include the full trade name, material composition or function of the goods, so the correct HS code can be assigned. Generic terms such as "spare parts" or "miscellaneous goods" can lead to queries from the authority and a hold on clearance.
When must an ENS be submitted for entry into Great Britain?
The ENS is submitted to HMRC in the Safety and Security GB service before the goods arrive in Great Britain. The minimum time limits are 2 hours before arrival for RoRo (ferries) and 1 hour for the Channel Tunnel, but in practice it is best submitted by the time of loading.
Is proof of origin needed for 0% duty in the UK?
Yes. The 0% duty under the TCA applies only to goods originating in the EU under its rules of origin and only with proof of origin: the exporter's statement on origin or the importer's knowledge. Buying goods in the EU does not by itself make them EU-originating.
Is an EUR.1 certificate proof of origin in EU–UK trade?
No. The EUR.1 certificate is not used for trade under the TCA. The proof is the exporter's statement on origin (with a REX number for consignments over EUR 6,000) or the importer's knowledge.
What happens if a driver arrives at the port without a valid GMR?
Without a valid GMR the carrier may be refused boarding onto the ferry or entry to the terminal. That means delay, rebooking and driver downtime, so the ENS and GMR data should be verified before departure.
Related guides
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