FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
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                      	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public
Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940	                      	

1. Name and Address of Reporting Person *

CHADWICK WILLIAM S JR	2. Issuer Name and Ticker or Trading Symbol

Ensco plc [ ESV ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
Executive Vice President & COO	
(Last)          (First)          (Middle)

5847 SAN FELIPE, SUITE 3300	3. Date of Earliest Transaction (MM/DD/YYYY)

7/25/2011		
(Street)

HOUSTON, TX 77057
(City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)

 	6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person	

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned	
1.Title of Security
(Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. Code
(Instr. 8)	4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)	5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)	
			Code	V	Amount	(A) or (D)	Price				
American Depositary Shares  	7/25/2011  	 	A	  	705  	A	$52.73  	205126  	D  	

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)	
1. Title of Derivate Security
(Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. Code
(Instr. 8)	5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)	6. Date Exercisable and Expiration Date	7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)	8. Price of Derivative Security
(Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)	
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares					
Employee American Depositary Shares Options (right to buy)  	$52.73  	7/25/2011  	 	A  	  	1038   	  	  (1)	7/25/2018  	American Depositary Shares  	1038  	$0  	1038  	D  	

Explanation of Responses:	
(  1) 	The options become exercisable in three equal annual installments beginning on July 25, 2012.	

Reporting Owners	
Reporting Owner Name / Address	Relationships	
	Director	10% Owner	Officer	Other	
CHADWICK WILLIAM S JR
5847 SAN FELIPE
SUITE 3300
HOUSTON, TX 77057			Executive Vice President & COO		

Signatures		
/s/ Elizabeth Wright, by Power of Attorney		7/27/2011	
** Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.	
*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).	
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).	
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.	
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 Ensco plc

 Power of Attorney

            WHEREAS, the undersigned, in his or her capacity as a director or officer or both,

as the case may be, of Ensco plc, an English limited company (the "Company"), may be required

to file with the Securities and Exchange Commission (the "Commission") under Section 16 of

the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated

thereunder (collectively, the "Exchange Act"), Forms 3, 4 and 5 ("Forms") relating to the

undersigned's holdings of and transactions in securities of the Company;

            NOW, THEREFORE, the undersigned, in his or her capacity as a director or

officer or both, as the case may be, of the Company, does hereby appoint Brady Long, Dean

Kewish and Elizabeth Wright, and each of them severally, as his or her true and lawful attorney-

in-fact or attorneys-in-fact and agent or agents with power to act with or without the other and

with full power of substitution and resubstitution, to execute in his or her name, place and stead,

in his or her capacity as a director or officer or both, as the case may be, of the Company, Forms

and any and all amendments thereto and any and all instruments necessary or incidental in

connection therewith, if any, and to file the same with the Commission and any stock exchange

or similar authority.  Each said attorney-in-fact and agent shall have full power and authority to

do and perform in the name and on behalf of the undersigned in any and all capacities, every act

whatsoever necessary or desirable to be done in the premises, as fully and to all intents and

purposes as the undersigned might or could do in person, the undersigned hereby ratifying and

approving the acts of said attorney.  The powers and authority of each said attorney-in-fact and

agent herein granted shall remain in full force and effect until the undersigned is no longer

required to file Forms under the Exchange Act, unless earlier revoked by the undersigned by

giving written notice of such revocation to the Company.  The undersigned acknowledges that

the said attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not

assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply

with Section 16 of the Exchange Act.

            IN WITNESS WHEREOF, the undersigned has executed this instrument this 27th

day of July, 2011.

                                          /s/ William S. Chadwick, Jr.

       William S. Chadwick, Jr.