Holding(s) in Company

TR-1: Notifications of Major Interests in Shares

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:

INFORMA PLC

2. Reason for notification (yes/no)

An acquisition or disposal of voting rights

YES

An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached 

An event changing the breakdown of voting rights

Other (please specify):______________

3. Full name of person(s) subject to notification obligation:

FMR LLC

4. Full name of shareholder(s) (if different from 3):

SEE SECTION 9 BELOW

5. Date of transaction (and date on which the threshold is crossed or reached if different):

28 JULY 2008

6. Date on which issuer notified:

4 AUGUST 2008

7. Threshold(s) that is/are crossed or reached:

12%

8: Notified Details

A: Voting rights attached to shares

Class/type of shares

If possible use ISIN code

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of shares

Number of voting rights

Number of shares

Number of voting rights

Percentage of voting rights

Direct

Indirect

Direct

Indirect

GB0002625654

50,686,304

50,686,304

51,036,304

51,036,304

12.00%

B: Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ conversion period/date 

No. of voting rights that may be acquired (if the instrument exercised/converted)

Percentage of voting rights

Total (A+B)

Number of voting rights

Percentage of voting rights

51,036,304

12.00%

9. Chain of controlled undertakings through which the voting rights and /or the financial instruments are effectively held, if applicable:

FMR LLC is the parent holding company of FIL Management & Research Company (FMRCO), Investment manager for US mutual funds, and FIL Management Trust Company (FMTC) and PyramiS Global Advisors Trust Company (PGATC), a US state chartered bank which acts as a trustee or investment manager of various pension and trust accounts and Pyramis Global Advisors LLC (PGALLC), holds:

2,082,000 shares in nominee: Brown Brothers Harriman and Co (Management Company is FMRCO)

5,298 shares in nominee: CIBC Mellon Trust (Management Company is FCL)

688,100 shares in nominee: Citibank NA (Management Company is FMR)

843,900 in nominee: JP Morgan Chase Bank (Management Company is FMR)

35,837,606 shares in nominee: JP Morgan Chase Bank (Management Company is FMRCO)

2,477,200 shares in nominee: Mellon Bank N.A. (Management Company is FMRCO)

3,820,000 shares in nominee: Northern Trust CO (Management Company is FMRCO)

5,185,800 shares in nominee: State Street Bank and TR CO (Management Company is FMRCO)

10,200 shares in nominee: State Street Bank and TR CO (Management Company is FMTC)

86,200 shares in nominee: CIBC Mellon Trust (C) (Management Company is FCL) 

Proxy Voting:

10. Name of proxy holder:

FMR LLC 

11. Number of voting rights proxy holder will cease to hold:

350,000 SHARES

12. Date on which proxy holder will cease to hold voting rights:

28 JULY 2008

13. Additional information:

N/A

14 Contact name:

DAVID MERRYWEATHER

15. Contact:

fil-regulatoryreporting@fil.com

Annex: Notification of major interests in shares

A: Identity of the persons or legal entity subject to the notification obligation

Full name 

(including legal form of legal entities)

INFORMA PLC

Contact address 

(registered office for legal entities)

37-41 MORTIMER STREET

LONDON, W1T 3JH

Phone number & email

020 7017 4314

[email protected]

Other useful information 

(at least legal representative for legal persons)

JULIE WILSON

DEPUTY COMPANY SECRETARY

B: Identity of the notifier, if applicable

Full name

Contact address

Phone number & email

Other useful information

(e.g. functional relationship with the person or legal entity subject to the notification obligation)

C: Additional information