These two were later additions to the ETAP complex. The Mirren field is located in UKCS block 22/25 and is named after Saint Mirren. It is an oil field with a gas cap in the Paleocene structure. The Madoes field is located in UKCS block 22/23 and is named after Saint Madoes. It is a light oil field located in the Eocene rock. Both are subsea tiebacks to the CPF, with the capacity for gas lift in the future to aid production. They are both operated by BP with Nippon Oil, Shell, Esso and AGIP.