Lansdowne Oil Regulatory News (LOGP)

April 18, 2011

Lansdowne Oil & Gas plc

Rig secured for Barryroe Oilfield appraisal drilling

Lansdowne Oil & Gas, ("Lansdowne" or "the Company" or "the Group") welcomes the announcement today that Providence Resources plc ("Providence"), as Operator, has contracted the semi-submersible rig the GSF ARCTIC 111 for appraisal drilling on the Barryroe oilfield in the Celtic Sea later this year.

Lansdowne looks forward to working with Providence to finalise the details of an appraisal well to be drilled on Barryroe in which Lansdowne has 20% working interest.

Commenting on the announcement Dr. Steve Boldy, CEO of Lansdowne said:

 "We are excited about the prospect of drilling an appraisal well on the Barryroe Oilfield this year, to follow-on from the acquisition and processing of the 3D seismic scheduled to commence in mid-June.."

Contacts

This resource update has been reviewed and approved by Steve Boldy, Chief Executive of Lansdowne. Steve Boldy is a geology graduate with a Ph.D from Trinity College Dublin and is a member of the Petroleum Exploration Society of Great Britain. He has 30 years' experience in the oil and gas exploration sector and is a qualified person as defined in the guidance note for Mining, Oil & Gas Companies, March 2006 of the London Stock Exchange.

About Lansdowne

Lansdowne is an exploration and appraisal oil and gas company listed in London on the AIM Market (Symbol : LOGP). Lansdowne holds a balanced portfolio of oil discoveries, low and moderate risk gas prospects near existing infrastructure and moderate risk oil prospects. The Company is focused on the underexplored North Celtic Sea Basin which has proven petroleum systems in place for both oil and gas. For more information, visit the Company's website: www.lansdowneoilandgas.com

About Barryroe

A third party audit carried out by RPS Energy for Lansdowne indicated P50 and P10 STOIIP estimates for Barryroe of 373 MMBO and 893 MMBO, respectively. The corresponding 2C and 3C Barryroe recoverable contingent resources are 59 MMBO and 144 MMBO, respectively.

Three wells within the 08/1 (Barryroe) Licensing Option area have tested oil:

48/24-1 drilled by Esso in 1973/1974 tested oil from Middle Wealden sands at an aggregate rate of 1,300 barrels per day

48/28-1 drilled drilled by Esso in 1974 tested oil from a Middle Wealden sand at 1,527 barrels per day

48/24-3 drilled by Marathon in 1990 tested oil from Lower Wealden sands at an aggregate rate of 1,619 barrels per day

Glossary of terms used in this Announcement

ALL FIGURES QUOTED ARE GROSS FIGURES, UNLESS OTHERWISE STATED

BOPD Barrels of Oil per Day

MMBO Millions of Barrels of Oil

BOEPD Barrels of Oil Equivalent per Day

STOIIP Stock Tank Oil Initially In Place