CMS Transition Overview 22 nd July

Key Attributes CMS Consequential Change Project is scoping high level change requirements as a result of Project Nexus detailed design impacts. CMS detailed design phase to follow UK Link detailed design and will include the development of iGT contacts. Transition principles are being captured with the identification of high level change requirements and solution delivery will form part of the detailed design phase. It is likely that new Contact Status’ will be created with the introduction of iGT & Unique Site Contacts 2

Consequential Change Impact High level requirements has identified the following assumptions*: * Impact Assessment of changes to Shipper Users based on current Design Analysis completed, this is subject to change until Detailed Design phase of both UKLP and CMS Consequential Change is completed. 3 Contact TypeContact Code Change Impact Assessment HighMedLow None Address AmendmentADD / UNC  Meter Point CreationMNC / FOM  Duplicate Meter PointDUP  Theft of GasTOG  Generic OperationsTYP / AGG / APP / ENQ / PSI / DMR / AQQ / FLE  Generic InvoicingGIC  Daily Meter QueryDMQ  Isolation RequestsISO  Prime & Sub Meter Set upPRS  Prime & Sub Meter ActionPSA  Erroneous ConfirmationECO  Filter Failure RequestsUSRV  Manage Must ReadsMUR  Request For AdjustmentRFA / CDQ  Previously Submitted ContactPSC  Search Functionality  Interfaces and File Formats 

Transition Principles An assumption can be made that CMS change delivery will be in line with the delivery of UKLink Replacement. Any contact raised from 1 st Oct 2015 will be treated according to the prevailing rules on that date, even where the data impacted spans or pre-dates cut over. Further discussion will take place with industry parties for arrangements in raising contacts leading up to the cut over date. 4

Transition Principles Cont. Considerations to be made regarding: –introduction of new contact codes –search functionality changes –file format developments; and –new processes in UKLR requiring CMS contacts iGT contacts in flight will be resolved by iGTs, contacts may only be raised from 1 st Oct 2015 for data received from that date. Unique site contacts in flight will be managed by the Unique Sites team, contacts may be raised in CMS from 1 st Oct