The fridge trailer on the dock looks like any other box until the inspector asks for its papers. Moving perishable food internationally is not ordinary haulage with a diesel cooler bolted on: it sits inside a UN agreement with vehicle approval, testing and certification behind it. Operators doing temperature-controlled work across borders need to know the ATP regime - and UK-only fridge work has its own, different rules.
GOV.UK’s guidance on getting a vehicle approved to transport perishable food by road explains the frame: you need to follow special rules to transport perishable food to or from 50 countries in a UN international agreement known as the ATP agreement. The agreement - whose French name translates as the agreement on the international carriage of perishable foodstuffs - exists so that a lorry-load of meat or dairy crossing several borders meets one recognised standard for the equipment keeping it cold, rather than fifty different national opinions.
The guidance is equally clear about the boundary: there are different rules if you are only transporting perishable food within the UK. The ATP regime is about international carriage. Domestic fridge work answers to domestic requirements instead - food hygiene law on the load side - which is a different rulebook, not a lighter version of the same one.
The ATP agreement sets out the requirements the guidance summarises - and the substance is about the equipment, not just the paperwork. Which vehicles and equipment can carry which classes of perishable food, the standards the insulated body and the refrigeration unit must meet, how that equipment is tested, and the certification that proves it. The page’s promise in its own heading is the practical route through it: how to get refrigerated or heated vans, trucks and trailers approved, and the documents you need to have.
Note the “or heated” in there. Temperature control is not only about keeping things cold - some perishable work needs keeping things above freezing, and the agreement’s world includes heated equipment too. Either way, the principle is the same: the vehicle’s ability to hold temperature is tested, certified and documented, not asserted.
The distinctive feature of the ATP regime is that approval attaches to the equipment. A transport company is not “ATP approved” as a business; each refrigerated or heated vehicle body carries its own certification, earned by testing its thermal performance. That has practical consequences operators learn quickly: the certificate travels with the vehicle, the test has a validity life that needs renewing, and a trailer swapped into the fleet mid-contract needs its own evidence before it can do the work. Buy a used fridge trailer for international perishable work and its ATP status is part of what you are buying - or part of what you discover is missing.
International fridge work adds the vehicle’s ATP documentation to everything else the movement already needs - the customs declarations, the health certificates for the food itself, the driver’s own documents. The load, the vehicle and the driver each carry their own layer of evidence, and a border inspection can ask for any of them. The operator running this work builds the check into dispatch: right vehicle, valid equipment certification, food documents from the exporter, driver documents current. Four yeses or the truck does not roll.
Equipment certification under the ATP regime is not permanent - the thermal performance of a body degrades as insulation ages and seals wear, so certificates have a validity life and vehicles come back for re-testing on a cycle. For the operator that means the fridge fleet needs its own compliance calendar alongside MOTs and O-licence dates: which vehicle, which certificate, which expiry. A lapsed equipment certificate discovered at a border is a load rejected or delayed with product warming by the hour - the most expensive admin lapse in temperature-controlled work.
Temperature-controlled international haulage is premium work precisely because the barriers are real: approved equipment, tested thermal performance, current certification, and customers whose entire cargo depends on the cold chain never breaking. The ATP regime is not bureaucracy to resent - it is the standard that lets a British fridge trailer work fifty countries with the same papers. Keep the certifications current, buy equipment with its documentation intact, and the regime becomes the moat that keeps the unserious out of your market.