Island Oil & Gas plc has spudded well 48/23-3 at Seven Heads West in the Celtic Sea offshore Ireland. The well is the first in its planned 2006 and 2007 drilling programs. Well 48/23-3 is designed to appraise a possible extension of the Upper Wealden gas sands that are producing gas in the 48/24-6 production well immediately to the east. The well, which is in a water depth of 329 feet, will be drilled to a planned total depth of 3,200 feet TVD ss. Island concluded a Sub-Area Equity Interest Assignment Agreement for the Seven Heads West area with Marathon International Petroleum Hibernia Limited, through its wholly-owned subsidiary Marathon Seven Heads Limited (formerly Ramco Celtic Sea Ltd) in February 2006.