When a UK customs query hits, speed comes from clarity. Check your MRN in the Customs Declaration Service (CDS), respond through CDS secure messaging, and coordinate with your broker and the National Clearance Hub (NCH) where required. This playbook shows the first 72 hours, the common hold types, and the proof you should keep.
TLDR
- Find the MRN and read the latest CDS message. Your next step depends on that message, not guesswork.
- Reply to HMRC requests using CDS document upload and secure messaging. Use NCH only where guidance says to do so.
- If Sanitary and Phytosanitary checks apply, book the Border Control Post (BCP) promptly and monitor local port health queues.
Step 1. Identify the hold and who owns it
- Get the MRN from your broker or TMS. MRN is the unique identifier CDS assigns to your declaration.
- Check CDS messages for document requests or data errors. Use CDS secure messaging and the document upload route to respond.
- Confirm the owner: HMRC customs, UK Border Force physical exam, or Port Health/BCP for SPS controls. Treatment depends on owner.
Proof note you can cite in emails
“We are responding through the Customs Declaration Service secure messaging and document upload functions against MRN [xxxx]. If escalation is needed, we will contact the National Clearance Hub per HMRC guidance.”
Step 2. The first 72 hours
Hour 0 to 24
- Pull the entry packet: commercial invoice, packing list, HS codes, valuation breakdown, origin evidence, licences or certificates, and any SPS paperwork.
- Log into CDS to view status and messages for the MRN. Upload any requested documents through the CDS route.
- If SPS applies, identify the correct Border Control Post for your commodity and confirm booking requirements.
Hour 24 to 48
- Resolve data mismatches that cause no-match or inventory link issues. Check that container number, bill data, and MRN align in the port’s CSP system.
- If HMRC has asked for supporting evidence, submit via CDS and include a short cover note that maps each file to the specific request.
- For SPS checks, confirm BCP booking, product location, and any handling requirements with the terminal or depot.
Hour 48 to 72
- Track message updates in CDS and keep time-stamped screenshots. If HMRC guidance directs contact, email the National Clearance Hub (NCH) with MRN and a concise summary of actions taken.
- Maintain a contemporaneous log of terminal appointment attempts and storage conditions. This supports later negotiation on storage or quay rent if delays were outside your control.
Common UK hold types and what clears them
| Hold type | What it means | What often clears it |
|---|---|---|
| Documentary check (HMRC) | Data or evidence requested on the CDS declaration | Upload requested docs via CDS. Correct declaration data if instructed. |
| Physical exam (Border Force) | Goods selected for inspection | Appointment with terminal or exam facility. Provide access and contact details. |
| SPS inspection at BCP | Animal, plant, or HRFNAO check | Book the correct BCP. Provide health certs, prenotifications, and pay fees. |
| Inventory or no-match error | Container or bill not linked to MRN in CSP | Broker updates link in CSP. Ensure data consistency across systems. |
| Duty, VAT, or guarantee issue | Payment method or deferment problem | Resolve payment method in CDS. Confirm duty deferment or cash account settings. |
Timing depends on port workload, exam station capacity, and, for SPS, BCP booking windows. Treat any durations you hear as planning ranges, not promises.
The controls and tools that matter
- CDS messages and document upload. This is how you respond to HMRC requests and send supporting files.
- MRN. This is your anchor for any query with HMRC, terminals, and port community systems.
- BCP process for SPS. Some commodities must be routed to specific BCPs. Check commodity coverage and book quickly.
- NCH contact. Use the National Clearance Hub where guidance instructs, and include MRN, location, and a concise action summary.
Two copy-ready emails
Subject: CDS query response and document upload for MRN [xxxx]
We have uploaded the requested documents against MRN [xxxx] using CDS and mapped each file to the request. Current location: [terminal or depot]. Please confirm if any additional data elements require amendment in the declaration.
Subject: Port health booking and status for MRN [xxxx] at [Port]
The consignment requires SPS checks at the [BCP name]. Booking reference: [ref]. Documents submitted: health certificate, prenotification, commercial invoice, packing list. Please advise earliest inspection slot and any handling instructions.
Centralize carrier tracking. Get instant alerts. Build a live watchlist that logs all container events across carriers in one shared view with TRADLINX Ocean Visibility.
References
- HMRC: Upload documents and get messages for CDS (how to respond to queries and send evidence).
- HMRC: CDS Declaration Completion Instructions for Imports (core data elements, updated July 17, 2025).
- HMRC Developer Guide: MRN glossary (definition and context of MRN, inventory linked sites).
- GOV.UK: SPS checks at Border Control Posts (BCP process and commodity coverage).
- HMRC: National Clearance Hub contacts (when and how to contact NCH).
- Suffolk Coastal Port Health: FAQs (Felixstowe exam time targets, example of local port health guidance).
This guide is general information for containerized ocean freight operations. It is not legal or compliance advice. Rules and clocks are jurisdiction specific and can change. Verify with your licensed customs broker, customs attorney, and the relevant agency before acting. Last reviewed: August 12, 2025.
Prefer email? Contact us directly at min.so@tradlinx.com (Americas), sondre.lyndon@tradlinx.com (Europe) or henry.jo@tradlinx.com (EMEA/Asia)
Leave a Reply