Cold-chain SOP
Joint standard operating procedure between Tweed Valley QA and Heatherstone ops, signed by both heads of compliance.
Case study · Cold-chain pharmacy
How Tweed Valley Pharmacies got to zero missed cold-chain boxes in twelve months.
An independent pharmacy chain with eleven branches across the Borders moved their refrigerated dispensary delivery from a national next-day courier to Heatherstone in early 2024. Eighteen months later, the missed-box rate has gone from fourteen a year to zero, and the QA team has stopped budgeting for write-offs.
- 14 → 0
- Annual missed-box incidents
- 99.6%
- On-time pre-12 hit rate
- £18k
- Saved on QA write-offs in year one
- 11 mo
- Time to ROI on the switchover
The brief
A chain of custody that didn't survive the night.
Tweed Valley Pharmacies dispenses around 220 refrigerated items a week — insulin variants, biologics, and a small set of veterinary specials — across eleven branches from Eyemouth to Innerleithen. The wholesaler picked the orders by 14:00 each day; the existing courier collected from a Carlisle warehouse at 18:00.
The problem was the overnight sort. Boxes left Carlisle in a refrigerated trailer, were transferred to a regional hub at 02:00, then onward to a final-mile vehicle at 05:00. The two handovers were where the cold-chain broke — fourteen excursion events in 2023, three of which led to a full write-off and one of which prompted an MHRA self-report.
The brief:design a delivery operation where the cold-chain doesn't break, the audit pack arrives before the QA lead asks for it, and the price doesn't go up by more than 8% versus the incumbent.
How the switchover ran
Twelve weeks, four phases, no incidents.
Discovery
Weeks 1–2
Two-week shadow audit of the existing courier. We rode along, watched the handovers, logged every excursion alert and every late delivery. The honest finding: the courier wasn't bad, but the chain of custody broke at the regional sortation hub overnight.
Design
Weeks 3–4
Built a depot-direct route — no overnight sort. Two named drivers covering the four-day-a-week run. Calibrated logger in every cool-box, audit pack auto-emailed to the QA team within 30 minutes of the last drop.
Pilot
Weeks 5–8
Four weeks of parallel operation — both couriers running the same route. Heatherstone hit 100% on-time and zero excursions; the incumbent had two near-misses. Switchover signed off at the end of week 8.
Steady state
Month 3 onwards
Weekly ops review for the first quarter, monthly thereafter. Eighteen months in, the named driver has a key to the dispensary back door and knows every pharmacist by name.
What we built together
Three artefacts, signed by both heads of compliance.
Audit pack template
PDF auto-generated per consignment: route map, logger trace, signed POD, driver name, vehicle reg.
Excursion playbook
If the in-box logger crosses +8°C for >15 min, the pharmacist on duty and the QA lead both get an SMS within 60 seconds.
“We ship pharmacist-only meds across the Borders four nights a week. Heatherstone is the first courier in a decade where I haven't had to chase a single missing box.”
Mhairi Sutherland
Operations Director, Tweed Valley Pharmacies · Galashiels
Got a cold-chain problem you'd like to switch off?
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