Temperature control does not stop at the loading bay: under GDP the supplier stays responsible until the medicine reaches the customer's delivery address, for ambient products as well as fridge lines. The one thing to remember: for every route you need evidence, either data from the journey itself or a validation sound enough to stand in for it.
Why it matters
The journey is the least controlled part of the chain
A store has walls, a stable load and a mapped probe. A van has none of that. The MHRA's 2020 transport blog says dark, solid-sided vans with no compartment cooling are more likely to get hot in summer, and curtain-sided trailers risk both high and low excursions. By air, the MHRA air freight guidance names the airport tarmac as the greatest and most frequent vulnerability.
Cold chain packing has its own traps. A cool pack touching the product, or one over-frozen in a freezer, can take a fridge line below its range, and the MHRA freezer blog calls checking whether a pack feels solid 'a false test of conditioning'. Ambient products are in scope too: the 2016 deficiency data record major findings for uncontrolled ambient transport with no risk assessment.
What the rules say
GDP chapter 9 and the clauses around it
For wholesalers the legal duty is regulation 43 of the Human Medicines Regulations 2012, which makes the GDP guidelines a licence condition; the MHRA GDP Inspectorate enforces it. Chapter 9 of the EU GDP Guidelines carries the detail. Section 9.2 says a risk assessment of delivery routes decides where temperature controls are needed, transport monitoring equipment is calibrated at least once a year, excursions are reported to the distributor and the recipient, and transport providers are told the conditions for each consignment.
Section 9.3 says container choice should consider external temperature extremes, maximum transit time including customs, and the packaging's qualification status. Section 9.4 asks for qualified packaging, containers or vehicles for temperature-sensitive products, seasonal mapping of temperature-controlled vehicles, cool packs that never touch the product, staff trained in box assembly, and control over cool pack reuse. Chapter 7 covers anyone you contract to carry the goods.
What inspectors and the other sectors add
The MHRA's 2016 transport blog suggests validated insulated containers for small volumes of lower-risk products on journeys under three hours, packs for longer journeys and refrigerated transport for larger volumes or likely delays. The three hours is the author's practical guide, not an EU GDP limit. It calls monitoring every refrigerated delivery best practice, with the data kept for five years and reviewed per consignment. The 2020 blog adds that where each shipment is not monitored "a very robust validation is required with clearly defined limits of validation", and that ex-works terms do not move GDP responsibility to the customer.
Outside wholesale the principles are the same at a smaller scale. Green Book chapter 3 asks practices taking vaccines to clinics for validated medical-grade cool boxes with a max/min thermometer, recorded at the start and end of each session. NHS SPS rules out domestic cool boxes, says cool packs are usually conditioned at +2 °C to +8 °C and that frozen packs are avoided unless the manufacturer recommends them. For quick-frozen food the law goes further: the ATP agreement and Regulation (EC) 37/2005 require recorders compliant with EN 12830.
What good looks like
Qualify the lane, then prove each journey
For a refrigerated van, WHO Supplement 11 describes a static mapping to find the load space's hot and cold spots, then at least four tests: maximum and minimum payload in the warmest season and again in the coldest, ideally on a real worst-case route with multiple drops. The vehicle is only provisionally qualified after the first season. For insulated shippers, the HPRA's IA-G0011 wants qualification under real transport conditions, to the furthest delivery point, with the time of packing recorded so the receiver can check arrival within the validated time.
Cool packs need a system, not a feel: the freezer blog asks you to trace each pack's conditioning time, use the phase-change temperature the product needs, and prevent mix-ups, for example by numbering packs.
- Assess the laneRoute, season, mode and worst-case duration, including delays and customs.
- Qualify the methodMap the vehicle or qualify the packaging, in both warm and cold seasons.
- Pack out to procedureConditioned packs, never touching the product; record the time of packing.
- Monitor the journeyA calibrated logger, calibrated at least once a year, or a validation sound enough to stand in.
- Review on receiptCheck the data for each consignment; quarantine anything in doubt.
- Act on excursionsTell the distributor and recipient, investigate, and let the RP decide.
Drawn from EU GDP chapter 9, MHRA Inspectorate blogs (2016, 2020) and WHO Supplement 11.
When someone else drives
Using a courier or 3PL moves the work, not the responsibility. EU GDP chapter 7 requires a written contract setting out each party's duties, an assessment of the contractor's competence, an audit before work starts and at a risk-based frequency after, and no subcontracting without your prior approval. The MHRA's 2020 blog says couriers should come from an approved, risk-assessed list, not be chosen on price. We recommend the written agreement also requires the carrier to report any excursion to you within one working day of the event, with the data (our recommendation; GDP sets no deadline).
Where stock rests on the way, the MHRA's 2016 receipt and storage blog sets the policy: a site holding ambient stock in transit for under 36 hours, with no change of ownership, need not be licensed; refrigerated stock needs a licensed site unless it stays overnight in continuously refrigerated vehicles.
Worked example
A summer delivery that runs late
This is an illustrative example; times, readings and hold time are invented. A wholesaler ships fridge lines in a passive shipper qualified for a summer pack-out with a 30-hour hold time.
Tuesday 06:10, packed and the time recorded; 06:30, collected by an approved courier. Tuesday 15:00, the courier reports a missed delivery window and the parcel goes out again next morning. Wednesday 10:00, the pharmacy receives it, downloads the logger and sees 9.4 °C for 50 minutes. Following the MHRA receipt advice, it quarantines the stock in its fridge and contacts the supplier.
What the supplier does: records the deviation, tells the recipient formally as EU GDP 9.2 asks, and asks the marketing authorisation holder for stability data that matches this excursion. The RP decides disposition on that evidence. What changes: the lane risk assessment now covers a missed window, and the courier contract defines what happens to failed deliveries.
Where it is unclear
Time limits that do not agree
Several numbers in transport guidance conflict or have aged. The 2016 MHRA transit policy uses 36 hours where the HPRA uses 48 (storage in transit). The April 2020 COVID flexibilities, including non-controlled transport below 20 °C and 96 hours at a transit hub, were framed as temporary but have not been formally withdrawn (COVID flexibilities). Return windows for fridge lines run from the MHRA's 24 hours in GB to EU GDP's 'for example 10 days', which is not the UK expectation (returns).
Method is unsettled too. WHO Supplement 11 allows a test chamber to simulate the seasons for vehicles, while the HPRA says chamber studies of shippers 'are not considered to be reflective of actual conditions'. Whether a short excursion counts, and whether mean kinetic temperature can excuse one, are covered under excursion duration and MKT.
Inspection findings
What inspectors have found
In the MHRA's 2016 GDP deficiency data, transportation (section 9.2) drew a major finding in 13% of the sampled inspections, second only to the quality system. Examples include no sound assessment of whether ambient products needed temperature control on every route, including third-party distributors; transport monitored with uncalibrated equipment; risk assessments with 'erroneous assumptions concerning UK climatic conditions'; no proof ambient products stayed within limits for the whole journey; and 'customer collects' arrangements never formalised.
The same data cite missing transport contracts, no audits of contract acceptors and 3PLs subcontracting without review. This is the only GDP-specific deficiency dataset found on GOV.UK, so treat it as a guide to common gaps rather than a current ranking.
In summary
The short version
- Risk-assess every route, ambient as well as cold chain, using real UK seasonal data.
- Qualify vehicles and packaging in both warm and cold seasons, under real conditions.
- Control cool packs: traceable conditioning, no contact with product.
- Monitor each journey with calibrated loggers, or hold a validation sound enough to stand in.
- Review the data for each consignment; keep it five years.
- Put couriers and 3PLs under written contracts, audit them and approve any subcontractor.
- Where the sources differ, assess the risk and record your reasoning.