Crossroads Well Southern Oklahoma USA Update

8 April 2026

Union Jack Oil plc

("Union Jack" or the "Company")

Crossroads Well Southern Oklahoma USA Update

Union Jack Oil plc (AIM: UJO), a UK and USA focused onshore hydrocarbon, production, development, exploration and investment company, is pleased to announce that Reach Oil and Gas Company Inc. (the "Operator"), has informed the Company that the Crossroads well, located in Southern Oklahoma, USA will be spudded on or around 16 April 2026. Union Jack currently holds a 43% interest. The Company's share of the drilling costs have already been funded.

· Crossroads will penetrate a large, 100 acre structure in the prolific Oil Creek Sand

· Estimated recoverable resource by the Operator over multiple target zones of 1,670,000 barrels of oil gross

· Crossroads is a large four-way dip closed structure mapped on 3D seismic

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

George Duxberry

Gneiss Energy Limited + 44 (0)20 3983 9263

Financial Adviser

Jon Fitzpatrick

Harbour Access +1 (475) 477 9402

USA Investor Relations

Jonathan Paterson