Horse Hill Update

Primorus Investments plc

("Primorus" or the "Company")

OGA Agrees Work Programme and Extends Retention Area Periods for Horse Hill Licenses, Weald Basin, SE UK

The Company announces that it has been informed by the operator, Horse Hill Developments Limited ("HHDL"), that the Oil and Gas Authority ("OGA") has consented to extend the current PEDL137 and PEDL246 Retention Areas ("RAs") until 2021. The PEDL137 and PEDL246 RAs, which cover the entirety of the licences, will now expire on 30th September and 30th June, 2021, respectively. The Company holds a 6.5% net interest in the licences via its 10.0% ownership of the licence's operator HHDL.

The RA work programmes, now agreed with OGA, comprise; the planned Horse Hill-1 ("HH-1") Kimmeridge and Portland production tests, HH-1z Kimmeridge Limestone ("KL") and HH-2 Portland appraisal wells, 50 km² of 3D seismic, 25 km of 2D seismic in PEDL246 and a PEDL246 exploration step-out well. The RAs for each licence can be further extended or modified subject to an ongoing minimum work programme agreed by the OGA.

HH-1 Oil Discovery

The HH-1 Kimmeridge Limestone and Portland oil discovery well is located within onshore exploration Licence PEDL137, on the northern side of the Weald Basin, 3 km north of Gatwick Airport. As previously reported in February and March 2016, two naturally-fractured limestone members within the Kimmeridge section, known as KL3 and KL4, flowed dry, 40-degree API oil, at an aggregate stabilised natural flow rate of 1,365 barrels per day ("bopd") with no clear indication of depletion. The overlying Portland flowed dry, 35-37 API gravity crude at a stable pumped rate of 323 bopd. The Portland was produced at the rod-pump's maximum achievable rate and thus flow was constrained by the pump's mechanical capacity.

As previously reported in October 2016 and March 2016, an application for long term production testing and further appraisal drilling was submitted to Surrey County Council in October 2016, and is now scheduled to be decided at the Council's planning committee meeting in July 2017. The Company therefore envisages that these operations will commence in the second half of 2017 upon grant of the necessary remaining regulatory permissions.

This announcement contains inside information for the purposes of Article 7 of EU Regulation 596/2014

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