The accounting officer, even if signing off without picking up irregularities, must raise valid errors and take the decision to cancel the bid; the City will then deal with any court challenge from bidders accordingly.
“Even if you pick up an error from the beginning of the process, you have a duty to raise that ... If it is an error that is valid, that might lead to a regularity, you cannot ignore that. We do take a decision to cancel that bid. We then leave that on us on any supplier who says, no, but you should not have cancelled this bid ... If a bidder chooses to take the City to court, we will then deal with it at that stage ... That is the process that we follow at the City from a practical perspective.”