Update 25 April 2013: Ofgem has approved these change proposals. There is no indication that much checking has been done.
DCP 128 and DCP 129 would replace the existing DNO-specific workbooks for Method M (calculation of LDNO discount factors) with DCUSA-issued workbooks.
The workbooks presented to the February 2013 DCUSA panel meeting for these DCPs do not seem to work, because formulas related to 2007/2008 allowed revenue and incentives and to non-load-related capital expenditure are missing. I think that, in order to reconcile the discounts published by DNOs in recent pricing notices with other published information about Method M, it is necessary to add DNO-specific (not common) formulas in the areas where the common template has missing formulas.
Update: apparently there was an administrative error and the wrong model was included in the change report; I have been sent a model which gives matching results for ENW, SPEN and WPD areas.
I have tried to reconcile published Method M input data with the discounts that each DNO has used in December 2012 indicative price notices. The results are embedded in the various datasets available with the model rules "Method M after DCP095 and DCP096 (from 1 April 2012)" from http://dcmf.co.uk/models/.
It will be interesting to see how much checking for manifest errors and inconsistencies Ofgem does before making its decision on these change proposals.