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 September 14, 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 Signet Group plc shares to which voting rights are attached: 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 Other (please specify): Loss of two accounts 3. Full name of person(s) subject to the notification obligation: Sanderson Asset Management Limited 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: 13 September 2007 6. Date on which issuer notified: 14 September 2007 7. Threshold(s) that is/are crossed or reached: 3% 8. Notified details: A: Voting rights attached to shares Class/type of Situation previous to Resulting situation after the triggering transaction shares the Triggering transaction if possible Number of Number of Number of Number of voting rights % of voting rights using the ISIN Shares Voting shares ix CODE Rights viii Direct x Indirect xi Direct Indirect GB00B1HTFP68 48,164,262 52,415,919 52,415,919 3.07% B: Financial Instruments Resulting situation after the triggering transaction xii Type of financial Expiration date Exercise/ Conversion Number of voting rights % of voting instrument xiii Period/ Date xiv that may be acquired if rights the instrument is exercised/ converted. Total (A+B) Number of voting rights % of voting rights 52,415,919 3.07% 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable xv: Proxy Voting: 10. Name of the proxy holder: Sanderson Asset Management Ltd 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: Sanderson Asset Management Ltd ("Sanderson") acts as investment manager for the clients detailed in Question 4 above (our " Clients"). In acting for our Clients, Sanderson are given full discretion over their investments and are empowered to vote on their behalf. However, we do not act as our Clients' custodian and therefore shares are not held in our name but in the name of each Clients' custodian bank. 14. Contact name: Jeremy Knowles 15. Contact telephone number: 0207-468-5977 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: September 14, 2007