Increased Interest in Horse Hill Oil Field

3 March 2014 Doriemus Plc ("Doriemus" or the "Company") Increase in interest of Horse Hill Prospect in the UK Weald Basin. Doriemus Plc (AIM: DOR) is pleased to announce that it has increased itsinterest to 10%, from the previously announced 7.5%, in Horse Hill DevelopmentLtd ("HHDL"), a special purpose company, that now owns a direct 65%participating interest and operatorship, in the highly prospective UK onshoreHorse Hill Oil Field in the Weald Basin. Doriemus has previously announced that the Horse Hill-1 well, which isscheduled to be completed by the end of August 2014, is planned to test anumber of conventional stacked oil targets at the proven productive Portlandsandstone, Corallian sandstone and Great Oolite limestone levels. Prospectiverecoverable resources totalling a mean 87 million barrels ("mmbbls") have beenestimated; with an additional mean 164 billion cubic feet ("bcf") ofrecoverable prospective resources proposed within the deeper Triassic gas play. Donald Strang, the Company's Chairman, commented: "The board sees the spudding of the Horse Hill-1 well over the next few monthsas an exciting development for the Company and for the overall prospectivityand potential of the Weald Basin as a whole." "The board has therefore decided, prior to spudding the well, to increase itsinterest in the operator, Horse Hill Development Limited to 10%." Transaction details: The consideration for the additional 2.5% interest in HHDL shall be satisfiedas follows: * Doriemus will immediately pay HHDL £3,333 towards the cost of the Horse Hill-1 Well; * On completion of all necessary legal documentation, expected to be completed within 30 days, Doriemus will make a further payment of £16,667 to HHDL towards the cost of the Well; and * Doriemus shall bear a further total sum of £130,000 of cash calls for the drilling of the Well to be drilled on the Horse Hill Licence to own the additional 2.5% interest in HHDL, thereby taking Doriemus's interest up to a 10% in HHDL. Glossary: Prospective Resources - Prospective resources are estimated volumes associatedwith undiscovered accumulations. These represent quantities of petroleum whichare estimated, as of a given date, to be potentially recoverable from oil andgas deposits identified on the basis of indirect evidence but which have notyet been drilled. This class represents a higher risk than contingent resourcessince the risk of discovery is also added. For prospective resources to becomeclassified as contingent resources, hydrocarbons must be discovered, theaccumulations must be further evaluated and an estimate of quantities thatwould be recoverable under appropriate development projects prepared. -END- For further information, please contact: Doriemus plc +44 (0) 20 7440 0640 Donald Strang / Hamish Harris Sanlam Securities UK Limited +44 (0) 20 7628 2200 Nominated Adviser and Broker Simon Clements / Virginia Bull