Edgar Filing: SIGNET GROUP PLC

FORM 6-K

FORM 6-K

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Special Report of Foreign Issuer

Pursuant to Rule 13a - 16 or 15d - 16 of
The Securities and Exchange Act of 1934

For the date of May 25, 2007

SIGNET GROUP plc
(Translation of registrant's name into English)

15 Golden Square
London W1F 9JG
England
(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40F.

Form 20-F X Form 40-F

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes No X

If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-

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: Signet 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 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

3. Full name of person(s) subject to the
notification obligation: Capital Group International, Inc

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

5. Date of the transaction and date on which the
threshold is crossed or reached: 23/05/07

6. Date on which issuer notified: 25/05/07

7. Threshold(s) that is/are crossed or reached: 9%

8. Notified details:

A: Voting rights attached to shares
Class/type Situation previous to the Resulting situation after the triggering
of shares Triggering transaction transaction
if possible
using the Number of Number of Voting Number of shares Number of voting % of voting
ISIN CODE Shares Rights viii rights ix rights

Direct Indirect Direct Indirect xi Direct Indirect
x

Ordinary
Shares 156,790,276 156,790,276 153,527,676 153,527,676 8.9979%

B: Financial Instruments
Resulting situation after the triggering transaction xii
Type of Expiration Exercise/ Number of voting rights that may % of
financial date xiii Conversion be acquired if the instrument is voting
instrument Period/ Date exercised/ converted. rights
xiv

N/A

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

153,527,676 8.9979%

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

Capital Group International Inc. ("CGII") holdings Number of shares Percent of outstanding

Holidngs by CGII Management Companies and Funds: 153,527,676 8.998%

Capital Guardian Trust Company 9,103,460 0.534%

Capital International Limited 111,539,380 6.537%

Capital International S.A. 17,023,210 0.998%

Capital International, Inc. 15,861,626 0.930%

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:

14. Contact name:

15. Contact telephone number:

Identity of the notifier

Full name:Mark Andrew Jenkins - Group Company Secretary

Contact address:Signet Group plc, 15 Golden Square, London, W1F 9JG

Phone number:0870 90 90 301

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

                                                                 SIGNET GROUP plc

                                                             By: /s/ Walker Boyd

                                                              Name: Walker Boyd
                                                                          Title: Group Finance Director

Date: May 25, 2007