Exhibit 25.1

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM T-1

STATEMENT OF ELIGIBILITY
UNDER THE TRUST INDENTURE ACT OF 1939 OF A
CORPORATION DESIGNATED TO ACT AS TRUSTEE

CHECK IF AN APPLICATION TO DETERMINE
ELIGIBILITY OF A TRUSTEE PURSUANT TO
SECTION 305(b)(2) o

THE BANK OF NEW YORK MELLON
TRUST COMPANY, N.A.

(Exact name of trustee as specified in its charter)

		95-3571558
(Jurisdiction of incorporation		(I.R.S. employer
if not a U.S. national bank)		identification no.)

400 South Hope Street
Suite 400
Los Angeles, California		90071
(Address of principal executive offices)		(Zip code)

Aon plc

(Exact name of obligor as specified in its charter)

England and Wales		98-1030901
(State or other jurisdiction of		(I.R.S. employer
incorporation or organization)		identification no.)

8 Devonshire Square
London, England EC2M 4PL
(Address of principal executive offices)		(Zip code)

Aon Corporation

(Exact name of obligor as specified in its charter)

Delaware		36-3051915
(State or other jurisdiction of		(I.R.S. employer
incorporation or organization)		identification no.)

200 East Randolph Avenue
Chicago, Illinois		60601
(Address of principal executive offices)		(Zip code)

4.250% Notes Due 2042
and Guarantee of 4.250% Notes Due 2042

(Title of the indenture securities)

1. General information. Furnish the following information as to the trustee:

(a) Name and address of each examining or supervising authority to which it is subject.

Name		Address
Comptroller of the Currency United States Department of the Treasury		Washington, DC 20219
Federal Reserve Bank		San Francisco, CA 94105
Federal Deposit Insurance Corporation		Washington, DC 20429

(b) Whether it is authorized to exercise corporate trust powers.

Yes.

2. Affiliations with Obligor.

If the obligor is an affiliate of the trustee, describe each such affiliation.

None.

16. List of Exhibits.

Exhibits identified in parentheses below, on file with the Commission, are incorporated herein by reference as an exhibit hereto, pursuant to Rule 7a-29 under the Trust Indenture Act of 1939 (the “Act”) and 17 C.F.R. 229.10(d).

1. A copy of the articles of association of The Bank of New York Mellon Trust Company, N.A., formerly known as The Bank of New York Trust Company, N.A. (Exhibit 1 to Form T-1 filed with Registration Statement No. 333-121948 and Exhibit 1 to Form T-1 filed with Registration Statement No. 333-152875).

2. A copy of certificate of authority of the trustee to commence business. (Exhibit 2 to Form T-1 filed with Registration Statement No. 333-121948).

3. A copy of the authorization of the trustee to exercise corporate trust powers (Exhibit 3 to Form T-1 filed with Registration Statement No. 333-152875).

4. A copy of the existing by-laws of the trustee (Exhibit 4 to Form T-1 filed with Registration Statement No. 333-162713).

6. The consent of the trustee required by Section 321(b) of the Act (Exhibit 6 to Form T-1 filed with Registration Statement No. 333-152875).

7. A copy of the latest report of condition of the Trustee published pursuant to law or to the requirements of its supervising or examining authority.

SIGNATURE

Pursuant to the requirements of the Act, the trustee, The Bank of New York Mellon Trust Company, N.A., a banking association organized and existing under the laws of the United States of America, has duly caused this statement of eligibility to be signed on its behalf by the undersigned, thereunto duly authorized, all in the City of Chicago, and State of Illinois, on the 25th day of March, 2013.

	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.

	By:	/s/ L. Garcia
	Name:	L. Garcia
	Title:	Vice President