“It is entirely routine for clients to seek Section 70 Detailed Assessment and for there to be a dispute between the parties as to whether the Bill in question is an interim statute, or interim non-statute, Bill. If the Solicitor prevails in arguing that it is an interim statute Bill and beyond the scope of Detailed Assessment, that is the end of it. However, if the client prevails in arguing that it is an interim non-statute Bill, the usual outcome is for an order that the Solicitor should render a final Bill for those costs, that will enable the same to be assessed as the client wishes.”