Spent some time recently tracing the history of the discount rate guidance in various recent editions of the Green Book and its supplementary documents. The guidance has changed, and in the latest Forthcoming Change notices from DfT, TAG is now taking more of it on board. It’s a complicated story. The kitchen table came in handy… Look out for the resulting thoughts, in this week’s edition of Local Transport Today. #GreenBook #appraisal #DfT #TAG