Assessing a safety case or a revision of a safety case (sent to the Executive pursuant to any provision of the 1997 Regulations) for the purpose of deciding whether to accept that safety case or revision, and accepting any such safety case or revision

The person conveying gas, the person intending to convey gas or the network emergency co-ordinator who has prepared the safety case or revision pursuant to that provision

Providing advice with respect to the preparation of a safety case or revision to a safety case which is proposed to be sent to the Executive pursuant to any provision of the 1997 Regulations

The person conveying gas, the person intending to convey gas or the network co-ordinator who has requested that advice

Assessing whether to grant an exemption pursuant to regulation 11 of the 1997 Regulations

The operator or owner who has requested the exemption