Doriemus plc

                         ("Doriemus" or "the Company")

                      Update - Horse Hill, UK Weald Basin

Doriemus plc (AIM: DOR) notes the comments in today's press in relation to the
Horse Hill licences. The Company has been informed that the current two
exploration licences over the Horse Hill licence area and their expiry dates
are as follows:

the PEDL137 licence (within which the Horse Hill-1 well was drilled and which
was the subject of the Company announcement of 9 April 2015) expires on 30
September 2015; and

PEDL246 licence expires on 30 June 2019.

Doriemus has also been informed that the operator of the two licences, Horse
Hill Developments Limited* ("HHDL"), has already applied to the Oil & Gas
Authority ("OGA") (formerly the Department of Energy and Climate Change) for a
one year extension of the exploration period of PEDL137.

The Company will update the market on this licence extension in due course.

Further, the Company has been informed by the PEDL137 operator, HHDL, that it
intends to conduct a flow test on Horse Hill-1 later in 2015 and that it has
already submitted the applications to the authorities for their consent.
Planning approval for a flow test on Horse Hill-1 is already in place, as this
was included in the original Surrey County Council planning approval. Subject
to the results of the flow test being successful, the operator would seek, in
conjunction with the OGA and other regulators, to move the PEDL137 licence into
the Production Period, via submission of a Field Development Plan to OGA.

Doriemus 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.  Doriemus owns a
10% direct interest in Horse Hill Developments Ltd ("HHDL").  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.

Note *: The PEDL137 and PEDL246 licenses are held 35% by Magellan Petroleum
Corporation and 65% by Horse Hill Developments Limited.

Enquiries:

Doriemus plc
Donald Strang/Hamish Harris                  +44 (0) 20 7440 0640


Cairn Financial Advisers LLP:
James Caithie / Carolyn Sansom               +44 (0) 20 7148 7900

Public Relations:
Square 1 Consulting Ltd                      +44 (0) 20 7929 5599
David Bick/Mark Longson