If a Prospective User
and a Service Provider are unable to agree on one or more aspects of access to
a Service the Prospective User or Service Provider may notify the Relevant
Regulator in writing that a dispute exists. A Prospective User or Service
Provider may not give a notice to the Relevant Regulator under this section
unless an Access Arrangement has been accepted by the Relevant Regulator (or
the Relevant Regulator has drafted and approved its own Access Arrangement)
with respect to the Covered Pipeline concerned.