determining common operational security requirements and principles;

determining common F1... system operational planning principles;

determining common load-frequency control processes and control structures;

ensuring the conditions for maintaining operational security F2...;

ensuring the conditions for maintaining a frequency quality level F3in the GB synchronous area;

promoting the coordination of system operation and operational planning;

ensuring and enhancing the transparency and reliability of information on transmission system operation;

contributing to the efficient operation and development of the electricity transmission system and electricity sector F4....

apply the principles of proportionality and non-discrimination;

ensure transparency;

apply the principle of optimisation between the highest overall efficiency and lowest total costs for all parties involved;

ensure TSOs make use of market-based mechanisms as far as possible, to ensure network security and stability;

respect the responsibility assigned to the relevant TSO in order to ensure system security F6...;

consult with relevant DSOs and take account of potential impacts on their system; and

take into consideration agreed F7... standards and technical specifications.