1. UNC Modification Proposal 0192 National Grid Distribution Proposal 0182: “ Introduction of DNO obligations to facilitate resolution of unresolved USRVs” UNC Distribution Workstream – 28 th February 2008 Chris Warner

2. Draft High level Business Rules  ‘Back stop’ terms requiring DNO to assume role of ‘last resort’ resolver of USRV  New definition required when USRV status changes (becomes [x]SRV)  Does not preclude User from entering into any ‘non-code’ arrangements with xoserve or any other agent to facilitate resolution of USRV

3. Draft High level Business Rules  Optimal period before status change  User must have opportunity and incentive to resolve  Code Mods 0637 & 0141  Between 18 months – 2 years optimal  Primary obligation to resolve USRV is with the User (who was registered when ‘filter failure’ occurred).  Evidence that clearance rates continues up to 2 years then slows significantly

4. Draft High level Business Rules  Upon status change USRV User to provide relevant data (where possible) upon request from DNO  Upon status change User may still resolve (up to point that DNO approves [x]SRV) but charge still applies  ‘Reasonable endeavours’ provision for DNO to resolve [x]SRV.  At DNO’s discretion, where not practicable to resolve, deemed allocation applied and [x]SRV lapses.

5. Draft High level Business Rules  Where site visit necessary, relevant User to facilitate access to property  DNO decision on resolution and subsequent billable volumes not subject to query in respect of the volume pursuant to TPD S4 by any User. DNO decision binding  Service chargeable irrespective of whether [x]SRV resolved or deemed allocation applied  Resolution of [x]SRV may result in new USRV. DNO will approve automatically.