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

INFORMA PLC

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

Yes

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

No

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

No

An event changing the breakdown of voting rights

No

Other (please specify):

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

AEGON UK GROUP OF COMPANIES

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

5. Date of the transaction and date on
which the threshold is crossed orwhich the threshold is crossed or
reached:reached: v

26th MAY 2010

6. Date on which issuer notified:

27th MAY 2010

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

3%

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type of
sharesshares

Situation previous
to the triggeringto the triggering
transactiontransaction

Resulting situation after the triggering transaction

if possible using
the ISIN CODEthe ISIN CODE

Number
ofof
SharesShares

Number
ofof
VotingVoting
RightsRights

Number
of sharesof shares

Number of voting
rightsrights

% of voting rights x

Direct

Direct xi

Indirect xii

Direct

Indirect

JE00B3WJHK45

17,858,042

17,858,042

16,597,337

16,597,337

1,382,438

2.78%

0.23%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial
instrumentinstrument

Expiration
datedate xiii

Exercise/
Conversion PeriodConversion Period xiv

Number of voting
rights that may berights that may be
acquired if theacquired if the
instrument isinstrument is
exercised/ converted.exercised/ converted.

% of voting
rightsrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financial
instrumentinstrument

Exercise price

Expiration date xvii

Exercise/
Conversion periodConversion period xviii

Number of voting rights instrument refers to

% of voting rights xix, xx

Contracts for Difference

n/a

n/a

n/a

63,933

Nominal

Delta

0.01

1

Total (A+B+C)

Number of voting rights

Percentage of voting rights

18,043,708

3.0%

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

AEGON UK Group of companies - parent undertaking of:

AEGON Asset Management UK plc

AEGON Investment Management UK ltd.

AEGON ICVC

Proxy Voting:

10. Name of the proxy holder:

AEGON UK Group of Companies

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

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

13. Additional information:13. Additional information:

AEGON UK Group of Companies consists of:

AEGON Asset Management UK plc

AEGON Investment Management UK ltd

AEGON ICVC

14. Contact name:

Miranda Beacham

15. Contact telephone number:

0131 549 3460

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)

22 Grenville Street, St Helier, Jersey JE4 8PX

Phone number & email

020 7017 4314

julie.wilson@informa.com

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