UK Oil & Gas PLC

("UKOG" or the "Company")

Extended Well Test ("EWT") and Regulatory Update

Horse Hill-1 ("HH-1") Portland and Kimmeridge Oil Discovery, Weald Basin, UK

Key Points:

·   Kimmeridge Limestone 4 ("KL4") EWT operations now underway. Further updates to follow in due course following flow stabilisation and pressure build up ("PBU") tests.

·   Final Xodus report determines that the single HH-1 well "sees" a connected Portland oil in place ("OIP") of approximately 7-11 million barrels, a robustly viable commercial volume for a single well.

·    Horse Hill Portland and Kimmeridge long-term production scoping report submitted to Surrey County Council ("SCC"). Overall plan includes a total of six production wells, with up to 3 production wells and a reservoir pressure support well in the Portland oil pool. A planning application for production will be submitted to SCC prior to the completion of the 2018 EWT programme.

UK Oil & Gas PLC (London AIM: UKOG) announces that HHDL, a UKOG subsidiary company and the operator of the HH-1 Kimmeridge Limestone and conventional Portland Sandstone oil discovery, has informed the Company that, following the successful Portland EWT programme, the KL4 EWT flow sequence operation has now commenced. HH-1 is located in licence PEDL137 in which UKOG holds a 46.735% beneficial interest.

Further to the reported Portland EWT results, Xodus have now delivered a report which details that, to date, the single HH-1 well has "seen" approximately 7-11 million connected barrels of the total full field OIP (or Stock Tank Oil Initially in Place "STOIIP") reported in the Company's July 2018 AIM re-admission document. Based upon modelled production profiles and oil recoveries, the Company and Xodus believe this to be a commercial connected OIP volume for a single well that supports the Company's envisaged multi-well Portland oil drilling and production programme. It should be noted that the calculated connected OIP should  not be misconstrued as recoverable volumes or reserves.

Given the EWT has delivered both commercially viable Portland flow rates and connected oil volumes, an internal declaration of Portland commerciality will be made shortly by HDDL.  

As the first part of the regulatory process necessary to deliver the Company's goal of long-term oil production at Horse Hill in 2019, HHDL has recently submitted an outline production scoping report to SCC.

The scoping report details the envisaged environmental impacts from the outline development's future drilling, production, decommissioning and site restoration phases. The envisaged development has a total of six production wells and assumes a maximum daily rate of around 3,500 bopd. During the production phase it is envisaged that should production capacity exceed 3,500 bopd an application to increase total produced volumes will be made. The Portland oil pool is envisaged to be produced via up to three wells and one pressure support well. As previously reported, regulatory permissions are in place to drill and flow test the first two new wellbores, HH-1z and HH-2 with a planned early 2019 spud date.

The scoping report and a table of estimated HGV movements during the production phase is available on the Company's website. Average HGV movements during the plan's 20-year field production life are estimated to total three per day.

Following SCC's feedback on the scoping report, HHDL will then submit a full-scale production planning application, currently planned before the completion of the current 2018 EWT programme.

Stephen Sanderson, UKOG's Chief Executive, commented:

"The Portland continues to out-perform our initial expectations and looks set to provide the production and cash flow base that can underpin UKOG's future growth. Our immediate operational focus now switches to the Kimmeridge EWT, which, if successful, has the potential to make Horse Hill one of the UK's leading onshore producing oil fields and to help unlock the value within our extensive Kimmeridge asset portfolio in the Weald."

About Xodus

Xodus are an international, globally recognised consultancy group providing engineering and advisory services to clients in the oil & gas, LNG, renewables and utilities industries worldwide.  They are certified as Competent Persons for the purposes of oil and gas resource and reserve assessments. More details can be found at www.xodusgroup.com

Qualified Person's Statement

Matt Cartwright, UKOG's Chief Operating Officer, who has over 35 years of relevant experience in the oil industry, has approved the information contained in this announcement. Mr Cartwright is a Chartered Engineer and member of the Society of Petroleum Engineers.

For further information, please contact:

UK Oil & Gas PLC

Stephen Sanderson / Kiran Morzaria                                                                      Tel: 01483 243450

WH Ireland (Nominated Adviser and Broker)

James Joyce / James Sinclair-Ford                                                                            Tel: 020 7220 1666

Cenkos Securities PLC (Joint Broker)

Joe Nally / Neil McDonald                                                                                          Tel: 0207 397 8919

Novum Securities (Joint Broker)                                                                                                              

John Bellis                                                                                                                     Tel: 020 7399 9400

Public Relations

Brian Alexander / David Bick                                                                                     Tel: 01483 243450

Glossary

UKOG Licence Interests

The Company has interests in the following UK licences:

Notes:

1.  Oil field currently in production.

2.  Oil discovery pending development and/or appraisal drilling.

3. Exploration asset with drillable prospects and leads. PEDL234 contains the Broadford Bridge-1 and 1z
    oil discovery well, the extension of the Godley Bridge Portland gas discovery plus further exploration
     prospects.

4.  UKOG has a 100% interest in UKOG (234) Ltd, which has a 100% interest in PEDL234.

5.  Oil discovery in 3 zones, EWT ongoing, two further wells HH-1z and HH-2 planned in early 2019

6.  UKOG has a direct 71.9% interest in HHDL, which has a 65% interest in PEDL137 and PEDL246.

The information contained within this announcement is deemed by the Company to constitute inside information under the Market Abuse Regulation (EU) No. 596/2014