FORM 6-K

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                          Report of Foreign Issuer


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


                           For the month of July


                                 BG Group plc
                         100 Thames Valley Park Drive
                                Reading RG6 1PT
                                    ENGLAND

                   (Address of principal executive offices)


The registrant files annual reports under cover of Form 20-F.  By furnishing
the information contained in this Form the reigistrant is not also furnishing
the information to the Commission pursuant to Rule 12g3-2(b) under the
Securities Exchange Act of 1934.




                                  BG Group plc

                      Notification of Interests in Shares

  Re-investment of dividends for person discharging managerial responsibility

Martin Houston, Executive Vice President & Managing Director, North America,
Caribbean and Global LNG

On 25 July 2007, the Company received notification from Rensburg Sheppards
Investment Management Limited that on 2 July 2007 they re-invested dividends
paid on shares held in Corporate PEPs managed for Martin Houston and his wife.
As a consequence, 14 BG Group ordinary shares were purchased at a price of
GBP8.295 per share, comprising 10 for Martin Houston and 4 for his wife.

As a result, Mr Houston's beneficial interests in the ordinary share capital of
BG Group plc are 268,015 shares, representing 0.0079% of the shares in issue.

26 July 2007
Website www.bg-group.com





                                 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.


                                BG Group plc


Date: 26 July 2007                               By: ___Ben Mathews___

                                                     Ben Mathews
                                                     Company Secretary