Holding(s) in Company

3i Infrastructure Ltd
16 March 2007

TR-1:               NOTIFICATION OF MAJOR INTERESTS IN SHARES



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



3i Infrastructure Limited



2. Reason for the notification:



An acquisition or disposal of voting rights



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



3i Group plc (direct)
3i Investments plc (indirect)



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



N/A



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



13 March 2007



6. Date on which issuer notified:



15 March 2007



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



46%



8. Notified details:


A: Voting rights attached to shares

Class/type   Situation previous to the         Resulting situation after the triggering transaction
of shares    triggering transaction

 if possible Number of Shares Number of Voting Number of     Number of voting rights       % of voting rights
using the                     Rights           shares
ISIN CODE
                                               Direct        Direct         Indirect       Direct        Indirect

JE00B1RJLF86 Nil              Nil              325,000,000   325,000,000    SEE SECTION 9  46.43%        SEE SECTION 9
                                                                            BELOW                        BELOW





B: Financial Instruments

Resulting situation after the triggering transaction

Type of financial   Expiration date   Exercise/          Number of voting      % of voting rights
instrument                            Conversion         rights that may be
                                      Period/Date        acquired if the
                                                         instrument is
                                                         exercised/ converted.
N/A                 N/A                      N/A         N/A                   N/A


Total (A+B)
Number of voting rights      % of voting rights

    325,000,000                     46.43





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



3i Group plc has a direct beneficial interest in the total number of voting
rights disclosed in section 8 above.

3i Investments plc (a wholly owned subsidiary of 3i Group plc) has an indirect
interest in the total number of voting rights disclosed in section 8 above in
its capacity as the discretionary Investment Manager of 3i Group plc.

3i Holdings plc and 3i plc are both wholly owned subsidiary undertakings of 3i
Group plc and parent undertakings of 3i Investments plc.



Proxy Voting:



10. Name of the proxy holder: N/A

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

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



13. Additional information:



14. Contact name:     Ceris Stafford



15. Contact telephone number:         020 7975 3414




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