Regency Mines plc

("Regency" or "the Company")

Update on Horse Hill Discovery

18 March 2015

Regency Mines plc (AIM:RGM) is pleased to announce that UK Oil and Gas Investments Plc ("UKOG"), has made the following positive news release with respect to the Horse Hill -1 well in the UK's Weald Basin.

Regency interest in Horse Hill:

The Horse Hill-1 well is located within onshore exploration license PEDL 137, on the northern side of the Weald Basin near Gatwick Airport. Regency owns a 5% direct interest in Horse Hill Developments Ltd ("HHDL"), and a 5.06% interest in Alba Mineral Resources plc (AIM:ALBA)("Alba"), which itself owns 5% of HHDL. As announced on 12 March 2015, Regency has agreed to sell its 5% direct interest in HHDL to Alba. HHDL is a special purpose company that owns a 65% participating interest and operatorship of licence PEDL 137 and the adjacent licence PEDL 246 in the UK Weald Basin. The participants in the Horse Hill-1 well are HHDL with a 65% working interest and Magellan Petroleum Corporation with a 35% interest.

For further information, please contact:

Andrew Bell 0207 747 9960 or 0776 647 4849 Chairman Regency Mines Plc

Roland Cornish/Rosalind Hill Abrahams 0207 628 3396 NOMAD Beaumont Cornish Limited

Jason Robertson 0129 351 7744 Broker Dowgate Capital Stockbrokers Ltd.

Christian Pickel 0203 128 8208 Media Relations MHP Communications

UKOG news Release of 18 March 2015 in full is as follows:

London listed UK Oil & Gas Investments PLC (LSE AIM: UKOG) is pleased to announce that ongoing well analysis of the Horse Hill-1 well ("HH-1") in the UK's Weald Basin with alliance partner NUTECH Ltd ("NUTECH") has identified that, in addition to the previously reported 102 feet of Portland sandstone gross oil pay, a further 407 net feet of potential oil pay calculated from electric logs exists within limestones and claystones of the Kimmeridge Clay ("Kimmeridge"), Oxford Clay ("Oxford") and Middle Lias ("Lias") Formations.

Stephen Sanderson, UKOG's CEO, commented:

"The additional 250 geochemical analyses confirm that the HH-1 well penetrated a very thick section of world class, thermally mature, oil saturated source rocks in the Kimmeridge section encasing the Kimmeridge limestones and we look forward to receiving NUTECH's further rock sample analyses and the resultant final log interpretation in the coming few weeks."

"Of greatest note is that NUTECH's initial log analyses, utilising all the geochemical calibration points, strongly indicates that the Kimmeridge contains a potential oil pay section calculated from electric logs of over 300 feet with a further 73 feet of potential oil pay in the Oxford and Lias. The fact that the Kimmeridge potential pay section displays elevated electric log resistivity measurements within a sampled zone exceeding 2% TOC adds strength to NUTECH's interpretation."

"NUTECH's further lab analyses, specifically focussed to help calibrate electric log measurements of total porosity, are thus absolutely fundamental to provide the company with confirmation of the potentially significant oil-in-place contained in the well. The data and analyses to date give strong encouragement that the company has encountered something new and substantive in the Kimmeridge section of PEDL137 and PEDL246 to add to the HH-1 Portland sandstone oil discovery."

Update on HH-1:

Further to the announcement of 17 December 2014, UKOG has now received and completed the analysis on all the outstanding 277 geochemical samples covering the main areas of interest in the HH-1 well within the PEDL137 and PEDL246 licences, as announced on 17 December 2014. Detailed geochemical analysis, comprising a total of 270 Total Organic Carbon ("TOC") and 28 RockEval pyrolysis analyses, was undertaken on drill samples, predominantly at 10 foot depth intervals, from 2510 to 5530 feet measured depth ("ftmd") and 6680-8620 ftmd covering the main formations of interest in the prospective Jurassic Portland, Kimmeridge, Oxford and Lias sections of the well. Furthermore, these geochemical analyses have been incorporated by NUTECH, one of the world's leading companies in petrophysical analysis and reservoir intelligence, into a preliminary electric log interpretation of the HH-1 well which demonstrates that, in addition to the previously reported 102 feet of Portland sandstone gross oil pay, a further 407 feet of potential oil pay exists in the well within the limestone and claystone sections of the Kimmeridge, Oxford and Lias Formations.

Geochemical results:

The results of the HH-1 detailed geochemical analysis confirm and conclude that the 1496 ft vertical thickness of Kimmeridge section in HH-1 contains three discrete thermally mature, highly organic rich, world class, claystone source rock units lying directly above, below and between the Upper and Lower Kimmeridge micritic limestone bands (see UKOG RNS Dec 17 2014). The Upper, Middle and Lower Kimmeridge source rock units contain in excess of 780 feet of drilled section exceeding 2% TOC by weight, with an average of 4.1% TOC. The richest section, and possible sweet spot, lies between the base of the Upper Limestone and Top Lower Limestone at 2931-3084 ftmd with an average of 5% TOC and a high of 9.4% TOC. Additional pyrolysis results confirm that the source richness of the three Kimmeridge source units is very high with measured Generative Potentials ("S2") ranging from an average of 35 kg/tonne to a high of 103 kg/tonne and with Hydrogen Indices ("HI") averaging 754 with a high exceeding 1000.

The new geochemical analyses demonstrate that an additional 140 feet thick, thermally mature, claystone source rock unit, exceeding 1% TOC, exists at the base of the Middle Jurassic Oxfordian to Cornbrash section from 5400-5540 ftmd. A distinct 50 foot section from 5450-5500 ftmd shows average metrics of 2.6% TOC, S2 of 16 Kg/tonne and an HI of 617. Furthermore a 60 foot thick section of the Lias from 7400-7460 ftmd exceeds 1% TOC, with average metrics of 1.5% TOC, S2 of 5 kg/tonne and HI of 443. More samples from this 60 foot Lias zone will be sent for additional RockEval pyrolysis.

Further geochemical analysis is planned in the well to understand the percentage of organic matter converted to hydrocarbons within all identified source units in the well together with values of initial TOC, S2 and HI prior to entering the hydrocarbon generative window

Thermal maturity:

As detailed in UKOG's 17 December 2014 RNS the Kimmeridge, Oxfordian and Lias sections in the well are interpreted to be thermally mature for hydrocarbon generation, with measured Vitrinite Reflectance ("Ro") exceeding 0.61% at 2720 ftmd/2450 feet true vertical depth ("tvdss"). The basal unit of the Kimmeridge section falls within the peak oil generation window with a measured Ro of 0.81% at 4180 ftmd/3530 ft tvdss.

NUTECH Initial Log Analyses:

Since the 29 January 2015 UKOG and Solo Oil Plc alliance with NUTECH, UKOG has been working closely with NUTECH's Houston based team to derive an initial view of electric log derived reservoir parameters, including oil in place volumes and rock mechanical properties, encountered in the HH-1 discovery.

NUTECH's initial electric log analysis, utilising the 298 geochemical samples for calibration, indicates that in addition to the Portland sandstone pay previously reported, the HH-1 well contains 407 net feet of net oil saturated potential pay within the limestones and claystones of Kimmeridge, Oxford and Lias sections of the well.

The three Kimmeridge source units with TOCs above 2%, are interpreted by NUTECH to contain a total of 334 feet of net oil saturated potential pay. This interpreted Kimmeridge pay section demonstrates an elevated resistivity response compared to background non-source units of similar lithology.

An additional 43 feet of potential oil pay within a gross 90 foot interval is interpreted to exist within the claystones of the Middle Jurassic Oxford and Cornbrash section. A 30 foot potential pay zone in claystones is also calculated in the Lias, however, this interval has only two samples both demonstrating less than 2% TOC.

The geochemical and NUTECH initial log interpretation results are summarised in Table 1 below:

Table 1: Geochemical and NUTECH initial log analysis run

Table 1: Geochemical and NUTECH initial log analysis run, source UKOG and NUTECH, *Calculated in a zone with 2 rock samples showing

UKOG has a net attributable interest of 20.82% in the discovery

NUTECH Further Analysis:

NUTECH are currently running a further suite of 116 samples from 58 depth-points from the HH-1 for XRD (X-Ray Diffraction) and MICP (Mercury Injection Capillary Pressure) analysis in the US to provide more detailed calibration of the electric log response. These results are expected within the next few weeks. The final NUTECH evaluation of HH-1, with oil in place volumes per US sector (640 acres or square mile) is expected to be available shortly thereafter.

In addition, UKOG is working with NUTECH on their analyses of key wells surrounding the 140 km2 (34,600 acres) PEDL137 and PEDL246 licences to further define the likely semi-regional extent and size of the Kimmeridge, Oxford and Liassic oil bearing formations encountered in the HH-1 well. NUTECH will also research their extensive database of global producing oil wells to furnish UKOG with source and reservoir metrics from potentially analogous rock formations to the Kimmeridge.

UKOG's interest in Horse Hill:

The Horse Hill-1 well is located within onshore exploration License PEDL 137, on the northern side of the Weald Basin near Gatwick Airport. UKOG now owns a 30% direct interest in Horse Hill Developments Ltd ("HHDL") and a 1.32% interest in HHDL via its 6% interest in Angus Energy Limited. HHDL is a special purpose company that owns a 65% participating interest and operatorship of Licence PEDL 137 and the adjacent Licence PEDL 246 in the UK Weald Basin. The participants in the Horse Hill-1 well are HHDL with a 65% working interest and Magellan Petroleum Corporation with a 35% interest.

Qualified Person's Statement:

Stephen Sanderson, UKOG's CEO, who has over 30 years of relevant experience in the oil industry, has approved the information contained in this announcement. Mr Sanderson is a Fellow of the Geological Society of London and is an active member of the American Association of Petroleum Geologists.

For further information please contact:

UK Oil & Gas Investments PLC

David Lenigas / Donald Strang Tel: 020 7440 0640

WH Ireland (Nominated Adviser and Broker)

James Joyce / Mark Leonard Tel: 020 7220 1666

Square 1 Consulting (Public Relations)

David Bick / Mark Longson Tel: 020 7929 5599