SDX Sdx Energy Plc

    FORM 8.1
                                        
    DEALINGS BY PERSONS WITH INTERESTS IN SECURITIES REPRESENTING 1% OR MORE
              (Rule 8.1(a) and (b)(i) of the City Code on Takeovers and Mergers)


1.   KEY INFORMATION

Name of person dealing        BARCLAYS PLC
(Note 1)                      
Company dealt in              SONDEX
Class of relevant security    ORD GBP0.10
to which the dealings being
disclosed relate (Note 2)
Date of dealing               31 August 2007

2.   INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE

(a)  Interests and short positions (following dealing) in the class of relevant
security dealt in (Note 3)

                             Long                        Short
                                           
                       Number       (%)           Number       (%)
                                           
(1) Relevant         1,893,604     3.33%           100,557   0.18%
securities
(2) Derivatives        131,822     0.23%           121,193   0.21%                 
(other than
options)
(3) Options and              0     0.00%                 0   0.00%        
agreements to
purchase/sell     
Total                2,025,426     3.56%           221,750   0.39%         


(b)  Interests and short positions in relevant securities of the company, other
     than the class dealt in (Note 3)

Class of                    Long                     Short
relevant
security:

                  Number           (%)      Number            (%)
                                                         
(1) Relevant                                
securities
  
(2) Derivatives                             
(other than
options)
  
(3) Options and                             
agreements to
purchase/sell
  
Total                                       


  (c)  Rights to subscribe (Note 3)

Class of relevant security:   Details

                              

3.   DEALINGS (Note 4)

(a)  Purchases and sales

Purchase/sale Number of Securities Price per unit
                                   (GBP)
Purchase      1,250                4.1650
Purchase      1,461                3.3997
Purchase      1,250                4.1000
Purchase      28,573               4.1070
Purchase      2,900                3.4275
Purchase      1,250                4.1650
Purchase      4,000                4.2400
Purchase      500                  4.0970
Purchase      2,500                4.2400
Purchase      5,000                4.0500
Purchase      1,125                3.4549
Purchase      1,125                3.4549
Purchase      1,567                3.7105
Purchase      1,250                4.1000
Sale          94                   3.6330
Sale          5,000                4.2275
Sale          1,811                4.2060
Sale          387                  3.9905
Sale          1,000                3.5553
Sale          1,000                3.5705
Sale          1,000                4.0305
Sale          5,000                4.2300
Sale          1,000                4.2003
Sale          1,242                4.2285
Sale          1,125                3.4549
Sale          29,725               3.9955
Sale          554                  3.4682
Sale          1,500                3.9828


(b)  Derivatives transactions (other than options)

Product    Long/Short    Number of Securities  Price Per
name,      (Note 6)      (Note 7)              Unit (GBP)
e.g. CFD
CFD        Short         1125                  3.4548
CFD        Short         1567                  3.7105
CFD        Short         28573                 4.1069
CFD        Long          1125                  3.4549
CFD        Long          554                   3.4681
CFD        Long          29725                 3.9955                                        

(c)  Options transactions in respect of existing securities

(i)  Writing, selling, purchasing or varying


Product name,   Writing,          Number of          Exercise  Type, e.g.      Expiry   Option money
e.g. call       selling,          securities to      price     American,       date     paid/received
option          purchasing,       which the option             European etc.            per unit (GBP)
                varying etc.      relates (GBP)                                      


(ii) Exercising

Product name, e.g.  Number of           Exercise price per
call option         securities          unit (Note 5)
                                        
                                        
                                        

(d)  Other dealings (including new securities) (Note 4)


Nature of transaction Details           Price per unit
(Note 8)                                (if applicable)
                                        (Note 5)
                                        




4.   OTHER INFORMATION
None

Agreements, arrangements or understandings relating to options or derivatives


Full details of any agreement, arrangement or understanding between the
person disclosing and any other person relating to the voting rights of
any relevant securities under any option referred to on this form or
relating to the voting rights or future acquisition or disposal of any
relevant securities to which any derivative referred to on this form is
referenced.  If none, this should be stated.




Is a Supplemental Form 8 attached? (Note 9)                 NO


Date of disclosure                         03 September 2007
Contact name                               BARCLAYS COMPLIANCE
Telephone number                           020 7116 2913
If a connected EFM, name of                
offeree/offeror with which connected
If a connected EFM, state nature of        
connection (Note 10)


Notes

The Notes on Form 8.1 can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk

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