Choose an agency that knows both customs systems (Polish and British), submits the ENS before the vehicle departs, is open about costs and has a procedure for when goods are held. Below are eight questions to ask before you sign a contract.
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Choosing a customs agency is a decision that directly affects how smoothly your shipments move, your operating costs and your customs risk exposure. A poor agency means a late ENS, a wrong HS code and goods sitting at the port. A good agency means operational peace of mind and lower risk. Below are eight questions worth asking before you sign a contract.
8 Questions and Answers Before Choosing a Customs Agency
1. Does the agency work 24/7?
This is the first and most important question for companies using road transport. Vehicles leave Poland in the evening and reach Dover or Folkestone in the early morning. If the ENS hasn't been submitted before departure, or an error turns up in the documents at 3am, you need an agency that will pick up the phone and solve the problem within minutes, not hours.
Check it: Call the agency at an unusual hour. How long do you wait for a reply? Does a real person answer, or an automated system?
2. Does the agency know both the Polish and the British customs systems?
The UK-PL route requires knowledge of two systems: the Polish one (PUESC, AIS for imports, AES for exports, NCTS for transit) and the British one (HMRC CDS, GVMS, IPAFFS). An agency working only on the Polish side, or only on the British side, cannot fully handle the whole chain. It's ideal to have a single agency covering both directions; see customs clearance from the UK for how that works.
3. How quickly does the agency submit the ENS?
According to HMRC, the ENS for roll-on roll-off ferry freight (accompanied or unaccompanied) must be submitted at least 2 hours before arrival in the UK, and for road traffic through the Channel Tunnel at least 1 hour before arrival at the Eurotunnel terminal in Coquelles (GOV.UK). A good agency submits the ENS well in advance, ideally at loading - not "somewhere along the way". Ask about the typical time between receiving the documents and submitting the ENS.
4. What is the fee for clearance and for the ENS?
Pricing transparency is a hallmark of a good agency. Before signing, you should know how each of these is charged (indicative costs are on how much UK customs clearance costs):
- import clearance (per declaration)
- the ENS/SSD
- the GMR (creating it in GVMS)
- surcharges for urgent declarations, corrections or IPAFFS handling
- the terms of any subscription-style contract (if you have regular shipments)
Avoid agencies that won't give you prices over the phone - that's a sign of hidden costs.
5. How does the agency classify goods (HS codes)?
An incorrect tariff classification is one of the most costly customs mistakes - it can mean underpaid or overpaid duty, and the risk of inspections and additional charges. See also how to find your commodity code. A good agency has internal HS code verification procedures and asks for the technical specification of the goods, not just their trade name. You can test an agency's competence by asking how they would classify a specific product you import.
6. What does communication with the driver look like?
A driver at the border needs the MRN and GMR numbers - and quickly. Check what format the agency uses to pass on this data: email, SMS, WhatsApp? Does the driver have a direct number for the dispatcher? Agree the channel and timing for passing on this data before the first shipment — the numbers are explained in GMR vs ENS.
7. Does the agency have references from your industry?
An agency that mainly handles removal goods and private parcels may not be familiar with the specifics of importing industrial components or food products from the UK. Ask which sectors they handle and ask for reference contacts. A good agency won't have any trouble naming 2-3 companies from a similar sector.
8. What happens if the vehicle is stopped at the border?
This is the "stress test" for an agency. Ask: "What do you do if HMRC stops our goods for inspection?" A good answer: a defined procedure, a dedicated point of contact with the authority, escalation to a senior handler, updates for the client every X minutes. A bad answer: "Well, we just wait for HMRC" - with no active management of the situation.
Red flags when choosing a customs agency
- No clear quote before you commit - the cost is only known after clearance
- Only a Polish office, with no knowledge of the UK GVMS/CDS systems
- Office hours limited to 9am-5pm only
- No way to reach an operator directly (only online forms)
- They don't ask questions about the goods - "the HS code from the last clearance will do"
- No professional indemnity insurance (customs agent's liability cover)
Summary: checklist for choosing a customs agency
- ✅ 24/7 availability (for overnight transport)
- ✅ Knowledge of both the Polish and British customs systems
- ✅ A clear quote before you commit (clearance + ENS + GMR)
- ✅ Fast ENS submission (before the vehicle departs)
- ✅ Competence in tariff classification (HS codes)
- ✅ Direct operational contact for drivers
- ✅ References from your industry
- ✅ A crisis procedure for when goods are held
Looking for an agency on the PL–UK route? Get in touch and describe your shipment; on authority to act see also indirect representation and direct representation.
Frequently asked questions
Do I need a written contract with a customs agency?
It's not a legal requirement, but it is strongly recommended. The contract should set out the scope of services, rates, response times, liability for mistakes and termination terms. Without it, it is hard to pursue a claim for an incorrectly submitted ENS or import declaration.
Can a customs agency act on my behalf without a power of attorney?
No. In the UK a representative cannot act for you without your written instructions stating whether they act directly or indirectly (GOV.UK). In the EU a customs representative must be empowered by the person represented, and customs may ask for evidence of that (Article 19 of the Union Customs Code).
Who is liable for mistakes in the declaration: me or the agency?
It depends on the type of representation. An indirect representative is jointly liable with you for the duties; with direct representation, liability as a rule stays with the person represented. Write the scope of liability into the contract.
When must the ENS be submitted for travel into the UK?
According to HMRC, for roll-on roll-off ferry freight the ENS is due at least 2 hours before arrival in the UK, and for the Channel Tunnel at least 1 hour before arrival at the terminal. A good agency files it well in advance, ideally at loading.
Where can I find a good UK–Poland customs agent?
Look for an agency that specialises in the UK–PL route, knows both customs systems, has an office or partners on both sides and is clear about out-of-hours contact. Ask for references from your industry and how they would classify a specific product.
Related guides
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