Budget Responsibility and National Audit Bill [HL]

I do not quite follow that. If the Treasury is going to disagree, or at least have the capability of disagreeing, with a forecast put forward by the OBR, how can it do that other than on the basis of a forecast of its own? I note that the word ““published”” was slipped into the Minister’s final sentence. Surely if the Treasury is going to have the capability of assessing and disagreeing with the OBR model, it must have some forecast of its own.