Press release

For (including discretionary)

64,540,423 votes

Against

10 votes

Withheld

0 votes

For (including discretionary)

64,506,570 votes

Against

0 votes

Withheld

33,862 votes

For (including discretionary)

64,540,423 votes

Against

0 votes

Withheld

10 votes

For (including discretionary)

64,420,208 votes

Against

120,215 votes

Withheld

10 votes

For (including discretionary)

63,014,163 votes

Against

1,526,259 votes

Withheld

10 votes

For (including discretionary)

63,037,075 votes

Against

1,247,946 votes

Withheld

255,411 votes

For (including discretionary)

64,468,732 votes

Against

71,690 votes

Withheld

10 votes

For (including discretionary)

64,493,040 votes

Against

47,382 votes

Withheld

10 votes

For (including discretionary)

64,468,732 votes

Against

71,690 votes

Withheld

10 votes

For (including discretionary)

64,420,208 votes

Against

120,215 votes

Withheld

10 votes

For (including discretionary)

63,369,360 votes

Against

1,171,062 votes

Withheld

10 votes

Resolution

Votes For (including discretionary)

Votes Against

Votes Withheld*

12 - Special

64,540,073 (100%)

0

360

13 - Special

64,540,083 (100%)

0

350

14 - Special

64,284,682 (99.6%)

255,401 (0.4%)

350

Resolution 12

ThattheCompanybeandisherebygenerallyandunconditionallyauthorisedinaccordancewiththeCompanies(Guernsey) Law,2008,asamended(the"CompaniesLaw")(subjecttotheListingRulesmade bytheUKListingAuthorityandallother applicablelegislationandregulations),tomakemarketacquisitions(asdefinedintheCompaniesLaw)ofeachclassofits shares (either for the retention as treasury shares for resale or transfer,or cancellation),PROVIDEDTHAT:

a.    themaximumnumberofsharesauthorisedtobepurchasedshallbe12,663,562OrdinaryShares (as defined in the Company's articles of incorporation (the "Articles") (being14.99percent.of theOrdinarySharesinissue(excludingsharesheldintreasury)asatthelatestpracticabledatepriortothedateofpublication of this document);

b.  the minimum price (exclusive of expenses) which may be paid for an Ordinary Share shall be one penny;

c.  the maximum price which may be paid for an Ordinary Share is an amount equal to the higher of: (a) 105 per cent. of the average of the middle market quotations for an Ordinary Share on the relevant market for the five business days immediately preceding the date on which the Ordinary Share is purchased; and (b) the higher of (i) the price of the last independent trade for an Ordinary Share and (ii) the highest current independent bid for an Ordinary Share at the time of purchase; and

d.  theauthorityherebyconferredshallexpireatthenextannualgeneralmeetingoftheCompanyduetobeheldin2019 unlesssuchauthorityisvaried,revokedorrenewedpriortosuchdatebyaspecialresolutionoftheCompanyinageneral meeting save that the Company may make an offer or agreement to acquire shares under this authority before its expiry whichwillormaybeexecutedwhollyorpartlyafteritsexpirationandtheCompanymaymakeanacquisitionofshares pursuant to such an offer or agreement as if the authority had not expired.

Resolution 13

That,inaccordancewithArticle6.7oftheArticles,theDirectorsbeempoweredtoallotandissue(orsellfromtreasury) equity securities (within the meaning of the Company's Articles) for cash as if article 6.2 of the Articles did not apply to any such allotment and issue, provided that this power shall be limited to the allotment and issue of (i) up to a maximum number of equity securities equal to 8,448,006OrdinarySharesintheCompany(being10percent.oftheOrdinarySharesinissueasatthelatestpracticabledate priortothedateofthisnotice)and(ii)anunlimited numberofOrdinarySharesinaccordancewiththePerformance AllocationReinvestmentAgreementdated23September2013betweentheCompanyandRiverstoneEnergyLimitedCapital PartnersL.P.,actingbyitsgeneralpartnerRiverstoneHoldingsIICayman,Ltd.("RELCP"),pursuanttowhichRELCP agreestoreinvesttheportionofeachPerformanceAllocation(asdefinedanddescribedinthe IPO Prospectus)attributableto RELCP,and shallexpireonthedatefalling15monthsafterthedateofpassingofthisResolution13ortheconclusionofthe nextannualgeneralmeetingoftheCompanyin2019,whicheveristheearlier,savethattheCompanymaybeforesuchexpiry makeoffersor agreementswhich wouldor mightrequireequity securitiesto beallottedandissued(or sold)after such expiry andthe Directors may allot and issue (or sell from treasury) equity securities in pursuance of any such offer or agreement notwithstanding that the power conferred by this Resolution 13 has expired.This resolution revokes and replaces all unexercised authorities previously granted to the Directors to allot and issue equity securities in the capital of the Company for cash as if the pre-emption rights contained in article 6.2 of the Articles did not apply to such allotment and issue but without prejudice to any allotment and issue of equity securities already made, offered or agreed to be made pursuant to such authorities.

Resolution 14

That the amendments to the Articles of the Company set out in the amended Articles of the Company tabled by the Chairman at the Annual General Meeting be and are hereby approved and adopted.