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 July 18, 2006

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-

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

1) Name of company

SIGNET GROUP plc

2) Name of shareholder having a major interest

HARRIS ASSOCIATES L.P.

3) Please state whether notification indicates that it is in respect of
holding of the shareholder named in 2 above or in respect of a
non-beneficial interest or in the case of an individual holder if it is a
holding of that person's spouse or children under the age of 18

As in 2 above. All holdings are for investment purposes only.

4) Name of the registered holder(s) and, if more than one holder, the
number of shares held by each of them

As in 2 above.

5) Number of shares/amount of stock acquired

800,000

6) Percentage of issued class

0.046%

7) Number of shares/amount of stock disposed

N/A

8) Percentage of issued class

N/A

9) Class of security

0.5p Ordinary Shares

10) Date of transaction

12.07.06

11) Date company informed

18.07.06

12) Total holding following this notification

191,993,300

13) Total percentage holding of issued class following this notification

11.04%

14) Any additional information

- -

15) Name of contact and telephone number for queries

MARK JENKINS

0870 909 0301

16) Name and signature of authorised company official responsible for
making this notification

Date of notification ..18 July 2006..

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:   July 18, 2006