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 November 21, 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:	Schroders plc	
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:	16 November 2007	
6. Date on which issuer notified:	20 November 2007 	
7. Threshold(s) that is/are crossed or reached:	                         Below 5%	

 

 

8. Notified details:	

 

A: Voting rights attached to shares	
Class/type of shares
 if possible using the ISIN CODE	Situation previous to the Triggering transaction	Resulting situation after the triggering transaction	
	Number of Shares	Number of Voting Rights viii	Number of shares	Number of voting rights ix	% of voting rights	
 			Direct	Direct  x	Indirect xi	Direct	Indirect	
GB00B1HTFP68
Ordinary	95,957,118	95,957,118	N/A	N/A	82,425,927	N/A	4.833%	

 

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

 

Total (A+B)	
Number of voting rights	% of voting rights	
 82,425,927	 4.833%	

 

 

9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable xv :	
Schroder Investment Management Limited                                                     36,626,163  2.15%
Schroder Investment Management North America Limited                           44,168,337  2.59%
Schroder Investment Management (Hong Kong) Limited                                280,120  0.016%
PT Schroder Investment Management Indonesia                                                64,707   0.01%
Schroder Investment Management (Japan)                                                        1,286,600  0.08%	

 

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:
 	The shares referred to in section 9 are held in portfolios managed by those firms on a discretionary basis for clients under investment management agreements.	
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:   November 21, 2007