Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

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

DEVELOPMENT SECURITIES PLC

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

An acquisition or disposal of voting rights

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

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

An event changing the breakdown of voting rights

Other (please specify):

Change of custodian

X

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

PRUDENTIAL PLC GROUP OF COMPANIES

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

SEE SCHEDULE BELOW

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

3 OCTOBER 2011

6. Date on which issuer notified:

4 OCTOBER 2011

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

SEE ITEM 13

8. Notified details:

A: Voting rights attached to shares

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights

Direct

Direct

Indirect

Direct

Indirect

10,910,307

10,910,307

10,910,307

10,910,307

8.91%

GB0002668464

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate

Exercise/ConversionPeriod

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Exerciseprice

Expirationdate

Exercise/Conversionperiod

Number of votingrights instrumentrefers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

10,910,307

8.91%

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

Prudential plc (parent Company)

M&G Group Limited (wholly owned subsidiary of Prudential plc)

M&G Limited (wholly owned subsidiary of M&G Group Limited)

M&G Investment Management Limited (wholly owned subsidiary of M&G Limited)

M&G Securities Limited (wholly owned subsidiary of M&G Limited)

Proxy Voting:

10. Name of the proxy holder:

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

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

13. Additional information:

Following a change of custodian for a large number of funds managed by M&G, the registration details have changed and are now as detailed on the attached report.

No other material changes have taken place

14. Contact name:

JAMES TODD / MARK THOMASM&G INVESTMENT MANAGEMENT LIMITED

15. Contact telephone number:

020 7548 2293 / 020 7548 3266