TALK.L Regulatory News (TALK)

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:

TalkTalk Telecom Group Plc

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

An acquisition or disposal of voting rights

X

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):

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

FMR LLC

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

See attached schedule

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

04 March 2011

6. Date on which issuer notified:

07 March 2011

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

5%

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

Indirect

Direct

Indirect

Direct

Indirect

GB00B4YCDF59

 46,233,341

 46,233,341

45,592,488

45,592,488

4.98

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

 45,592,488

 4.98

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

See attached schedule

Proxy Voting:

10. Name of the proxy holder:

FMR LLC

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

640,853

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

04 March 2011

13. Additional information:

None

14. Contact name:

Robert Crayston

15. Contact telephone number:

fil-reporting@fil.com 01737 836 241

Issuer name:

TALKTALK TELECOM

GROUP PLC

Current ownership percentage:

4.98%

Total shares held:

45,592,488

Issued share capital:

914,108,245

SHARES HELD

NOMINEE

MANAGEMENT COMPANY

FMR LLC is the parent holding company of Fidelity

8,717,300

BROWN BROTHERS HARRIMAN AND CO

FMRCO

Management & Research Company (FMRCO), investment

206,500

BROWN BROTHERS HARRIMAN AND CO

PTC

manager for US mutual funds, FIL Management Trust

180,400

CIBC MELLON TRUST

FCL

Company (FMTC), Pyramis Global Advisors Trust Company

19,425,629

JP MORGAN CHASE BANK

FMRCO

(PGATC), a US state chartered bank which acts as a trustee

133,300

JP MORGAN CHASE BANK

FMTC

or investment manager of various pension and trust accounts

2,400,400

JPMORGAN CHASE BANK

PTC

Pyramis Global Advisors LLC (PGALLC) and

538,300

MELLON BANK N.A.

FMRCO

Pyramis Trust Company (PTC).

277,400

MELLON BANK N.A.

FMTC

1,372,100

MELLON BANK N.A.

PTC

264,900

NORTHERN TRUST CO

FMRCO

638,200

NORTHERN TRUST CO

FMTC

1,196,300

STATE STREET BANK AND TR CO

FICL

3,249,000

STATE STREET BANK AND TR CO

FMRCO

861,000

STATE STREET BANK AND TR CO

FMTC

2,914,659

STATE STREET BANK AND TR CO

PTC

858,400

CIBC MELLON TRUST (C)

FCL

995,000

ROYAL TRUST-TORONTO

FCL

551,300

MELLON BANK NA (C)

PTC

185,000

BANK OF NEW YORK MELLON

PTC

417,500

NATIONAL BANK TRUST (C)

FCL

209,900

ROYAL TRUST- TORONTO (C)

FCL