The Mansell discovery is located in licence P.2448 in UKCS Block 3/8g south and east of the Ninian and Columba fields. Mansell was discovered by well 3/8b-10, drilled by BP in 1985 and following successful appraisal was developed as a subsea tieback to the Ninian South Platform and produced between 1992 and 1995 (Field was then named as Staffa). The field was shut in 1995 following waxing-up of the flowline and decomissioned. Serica undertook work to determine the feasibility and timing of a redevelopment, however it has not been possible to identify a viable host facility in this area of the Northern North Sea and hence Serica expects to relinquish this licence by the end of Q3 2025. The Mansell field comprises 8.3 mmboe of Serica’s stated 2C resources.