A freight tender can contain a low emissions figure from every bidder and still provide no reliable comparison. One carrier may report the main transport leg, another may include collection and handling, and another may apply a fleet average unrelated to the offered service. Procurement needs to make the reporting request clear before treating the results as comparable.
The GHG Protocol's value chain guidance includes transportation and distribution calculation methods. Its existence does not mean that every supplier figure uses the same method or boundary. A UK shipper should ask enough questions to understand the evidence behind the proposed service.
Define a shared reporting request
Provide the same lane description, shipment pattern and service requirement to all bidders. State the activities the comparison should include and ask suppliers to identify any exclusions. Require the reporting period, units and method alongside the result, rather than accepting an isolated carbon number.
Ask which inputs are measured, allocated or estimated. A supplier with strong activity records may provide a more defensible figure than one offering a very low result from unexplained assumptions. Make evidence quality visible in the evaluation so that the tender rewards transparency rather than numerical attractiveness alone.
Check how subcontracting is handled. The contracting carrier should explain whether underlying haulier activity is represented and how records reach the reporting process. A company wide sustainability report can be useful context, but it does not establish the performance of every subcontracted lane offered in a tender.
Turn promises into reviewable terms
Agree the data to be supplied after implementation and the process for correcting errors. Define how changes in fleet, route or service arrangement will be disclosed. Procurement and sustainability staff should have enough information to distinguish operational improvement from a change in calculation practice.
Use a trial period to reconcile reporting with shipment records. Discuss missing movements and unexpected variation with the provider. A constructive review can improve the dataset while revealing practical opportunities, such as consolidating flexible shipments or adjusting an unnecessarily complex route.
Carbon data should support a wider service decision that includes reliability, cargo condition and cost. It becomes more useful when the business knows what the number represents and can observe it over time. A well specified tender gives suppliers a fair comparison and gives the shipper a clearer route from procurement promises to operational evidence.
Sources
- Scope 3 Calculation Guidance Source accessed 2026-10-13.
Illustrative photograph: Nuno Marques / Unsplash.
