In WORKING ON WELLBEING LTD v SoS (2025) EWCA Civ 127 Coulson LJ (with whom Frazer and Zacaroli LJJ agree) summarises the relevant principles as follows:-
“82. I consider that the authorities demonstrate that there are three stages to consider when addressing whether or not, in the particular circumstances of any given case, a contracting authority has the discretion to seek clarification, when that discretion becomes a duty, and what the permissible limits are to any response to a request for clarification.
Stage One
- The first stage arises only where the error or ambiguity is obvious to the contracting authority and is material to the outcome of the competition. That will be rare, which explains why any duty to seek clarification will only arise in exceptional cases … the only question is whether the error or ambiguity was obvious to the contracting authority: it is not a question of the error or ambiguity being “objectively verifiable”.
- All of the cases stress that the error of ambiguity must be “serious” and “manifest”… The error or ambiguity must also be “material” or “significant”: it must be relevant to the “outcome” of the tender process… If the error or ambiguity is immaterial or irrelevant to the final outcome of the competition, no further action is necessary.