A system giving customers a right of access to transmission and distribution systems on the basis of negotiated tariffs. It thus enables to provide spare capacity in pipelines to third parties upon payment of a negotiated tariff. Since tension often exists between the owners of fields and the owners of infrastructure, in many areas a code of practice has been put in place. This helps to streamline and facilitate the timely application of the processes of seeking, offering and negotiating third party access to offshore pipelines and processing facilities as well as onshore terminals. It helps to ensure that access is easy and fair, with terms offered on a negotiated but non discriminatory basis