2 July 2025

This announcement contains inside information for the purposes of Article 7 of the Market Abuse Regulation (EU) 596/2014 as it forms part of UK domestic law by virtue of the European Union (Withdrawal) Act 2018 ("MAR"), and is disclosed in accordance with the Company's obligations under Article 17 of MAR.

Union Jack Oil plc

("Union Jack" or the "Company")

  Resumption of Production at Keddington Oilfield

Union Jack Oil plc (AIM: UJO, OTCQB: UJOGF), a UK and USA focused onshore hydrocarbon, production, development, exploration and investment company is pleased to announce that following major site upgrades during 2024 and 2025, production has recommenced at the Keddington Oilfield ("Keddington").

During June 2025, Keddington produced a total of 992 barrels of oil over 23 days of timed pumped production averaging 10.4 hours per day with an average flow-rate of 43 barrels per day gross during the period.  The newly installed equipment and facilities are working well and continue to be fine-tuned to optimise production.

Union Jack holds a 55% interest in Keddington.

David Bramhill, Executive Chairman of Union Jack, commented: "As expected, current flow rates from Keddington are exhibiting a material increase in oil production to those seen prior to the site upgrades.

"Over 1,450 barrels of high-quality oil have now been produced and sold from Keddington since recommissioning, contributing meaningful additional revenues, complementing our established cash flow from Wressle in the UK and our growth projects in the USA at Moccasin, the Andrews Field and our Mineral Royalty portfolio."

For further information, please contact:

Union Jack Oil plc                                                                                  [email protected]

David Bramhill

SP Angel Corporate Finance LLP                                                        +44 (0)20 3470 0470

Nominated Adviser and Joint Broker

Matthew Johnson

Richard Hail

Jen Clarke

Zeus Capital Limited                                                                            +44 (0)20 3829 5000

Joint Broker

Antonio Bossi

Simon Johnson

James Hornigold

Gneiss Energy Limited                                                                         + 44 (0)20 3983 9263

Financial Adviser

Jon Fitzpatrick

Paul Weidman

Harbour Access                                                                                      +1 (475) 477 9402

USA Investor Relations

Jonathan Paterson