Three U.K.-listed oil companies announced Friday that they have discovered oil and gas at their jointly owned Zebedee well in the Falkland Islands. The well will now be plugged and the Eirik Raude rig will then drill the first exploration test of the Elaine/Isobel complex in the southern part of the North Falkland basin. The results of this well, called the Isobel Deep well, are expected in late April. “We now look forward to the results of the upcoming Isobel Deep well, potentially the highest impact well in this campaign,” said Andrew Lodge, Exploration Director at Premier Oil PLC (PMO.LN). The other companies involved in the exporation project in the U.K. island territory, situated in the southern Atlantic to the east of Argentina, are Falkland Oil & Gas Ltd.(FOGL.LN) and Rockhopper Exploration PLC (RKH.LN). -Write to Alex MacDonald at alex.macdonald@wsj.com