Holding(s) in Company

Morgan Sindall PLC
06 March 2007

TR1: NOTIFICATION OF MAJOR INTERESTS IN SHARES


1       Identity of the issuer or the underlying    Morgan Sindall plc
        issuer of existing shares to which voting
        rights are attached:
2       Reason for the notification:                An acquisition or disposal of voting rights
3       Full name of person(s) subject to the
        notification obligation:
                                                    Aviva plc & its subsidiaries

4       Full name of shareholders(s):               Registered holder:



                                                    BNY Norwich Union Nominees Limited         573,338*
                                                    Chase GA Group Nominees Limited          1,439,987*
                                                    Chase Nominees Limited                     117,491*
                                                    CUIM Nominee Limited                       480,461*

                                                    * denotes direct interest

                                                    BNY Norwich Union Nominees Limited         148,187      
                                                    Chase Nominees Limited                      54,544
                                                    CUIM Nominee Limited                        36,539                  
                                                    Vidacos Nominees Limited                   697,878 
                                                    DLI Sustainable Futures Fund                19,019                  
  

5       Date of the transaction and date on which
        the threshold is crossed or reached:        2 March 2007

6       Date on which issuer notified:              6 March 2007

7       Threshold(s) that is/are crossed or         5% to 6% change at direct interest level
        reached:

8       Notified details:

A:  Voting rights attached to shares


Class/type of shares  Situation previous to the triggering transaction
If possible using the
ISIN code
                      Number of shares                              Number of voting rights


GB0008085614          3,078,426                                     3,078,426


Class/type of shares  Resulting situation after the triggering transaction
If possible using the
ISIN code
                      Number of shares              Number of voting rights         % of voting rights
                                                    Direct          Indirect        Direct         Indirect


GB0008085614          2,611,277                     2,611,277       956,167         6.14%          2.25%

B:  Financial instruments


Resulting situation after the triggering transaction


Type of financial       Expiration    Exercise/Conversion           Number of voting rights     % of voting rights
instrument              date                                        that may be acquired if the
                                      Period/Date                   instrument is exercised/
                                                                    converted
N/A


Total (A+B)


Number of voting rights                             % of voting rights


3,567,444                                           8.39%


9       Chain of controlled undertakings through    See section 4
        which the voting rights and/or the
        financial instruments are effectively held,
        if applicable:
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:

14      Contact for further information:            Mary Nettleship, Company Secretary

15      Contact telephone number:                   020 7307 9218

Annex to Notification of Major Interests in Shares


A:  Identity of the person or legal entity subject to the notification obligation


Full name (including legal form for legal entities) Aviva plc and its subsidiaries

Contact address (registered office for legal
entities)

Phone number                                        01603 684420

Other useful information (at least legal            Neil Whittaker
representative for legal persons)

B:  Identity of the notifier, if applicable


Full name                                           Global Reporting Unit, Aviva Plc

Contact address

Phone number

Other useful information (eg functional
relationship with the person or legal entity
subject to the notification obligation)




                      This information is provided by RNS
            The company news service from the London Stock Exchange