CM067: National Grid Legal Separation - consequential changes to reference NGESO into STC Section B and changes to STC Modification Panel membership to add NGESO as Member

This proposal seeks to modify the System Operator Transmission Owner Code (STC) to reflect the creation of a new National Grid Electricity System Operator (NGESO) that is legally separated from National Grid Electricity Transmission Limited.  References to NGET have been replaced by NGESO, where relevant, throughout the STC Section B in order to ensure the System Operator and Transmission Owner obligations are clear. Changes also include in Section B, NGESO as a new STC Modification Panel member and as a voting member in the STC Group.