1. Project Nexus Next Steps Xoserve/Large GT View – 6 December 2011

2. Background Ongoing discussions at PN UNC about approach to raising UNC Modifications Discussions at October PNAG Xoserve invited to meet Ofgem in October to discuss approach to impact analysis Ofgem presentation at PN UNC on 21 November

3. Xoserve/GT Suggested Next Steps Milestone – Sign-off of all BRDs Ofgem conduct industry consultation Xoserve perform Options Analysis (incl indicative costs) Xoserve develop internal requirements Ongoing updates to PN UNC & clarification as required Industry review of outcomes and cost/benefit analysis Agree revised scope and implementation priorities Timetable for detailed UNC Mods aligned to implementation plan Network Review * See Next Slide

4. Industry Consultation – Key Elements Inputs … Executive Summary of the BRDs* Ofgem’s uptake Scenarios* Xoserve Product usage questionnaire Industry views on Proposals and Priorities … Informs * Drafted by Xoserve Shipper costs and benefits – by Scenario *Including mandatory 100% usage of Product 1 or 2 Shipper estimates of most likely take-up profile – by Product *Including financial benefits & impacts on Relevant Objectives