Director/PDMR Shareholding

NOTIFICATION OF TRANSACTIONS OF DIRECTORS, PERSONS DISCHARGING MANAGERIAL
RESPONSIBILITY

This form is intended for use by anissuer to make a RIS notification required
by DR 3.1.4R(1).

(1) An issuer making a notification in respect of a transaction relating to the
shares or debentures of the issuer should complete boxes 1 to 16, 23 and 24.

(2) An issuer making a notification in respect of a derivative relating the
shares of the issuer should complete boxes 1 to 4, 6, 8,13, 14, 16, 23 and 24.

(3) An issuer making a notification in respect of options granted to a director
/person discharging managerial responsibilities should complete boxes 1 to 3
and 17 to 24.

(4) An issuer making a notification in respect of a financial instrument
relating to the shares of the issuer (other than a debenture) should complete
boxes 1 to 4, 6, 8, 9, 11, 13, 14, 16, 23 and 24.

Notification of Transactions of Directors/Persons Discharging Managerial
Responsibility and Connected Persons

Please complete all relevant boxes should in block capital letters.

1.   Name of the issuer                2.   State whether the notification     
                                            relates to (i) a transaction       
                                            notified in accordance with DR     
                                            3.1.4R(1)(a) ; or                  
                                                                               
                                            (ii) DR 3.1.4(R)(1)(b) a disclosure
                                            made in accordance with section 324
                                            (as extended by section 328) of the
                                            Companies Act 1985; or             
                                                                               
                                            (iii) both (i) and (ii)            
                                                                               
     Caledonia Investments plc              Both (1) and (2)                   
                                                                               
3.   Name of person discharging        4.   State whether notification relates 
     managerial responsibilities/           to a person connected with a person
     director                               discharging managerial             
                                            responsibilities/director named in 
                                            3 and identify the connected person
                                                                               
     C W Cayzer                             N/A                                
                                                                               
5.   Indicate whether the notification 6.   Description of shares (including   
     is in respect of a holding of the      class), debentures or derivatives  
     person referred to in 3 or 4           or financial instruments relating  
     above or in respect of a               to shares                          
     non-beneficial interest                                                   
                                                                               
     Non-beneficial interest                Caledonia Investments plc ordinary 
                                            5p                                 
                                                                               
7.   Name of registered shareholders   8    State the nature of the transaction
     (s) and, if more than one, the                                            
     number of shares held by each of                                          
     them                                                                      
                                                                               
     Caytrust Finance Company Ltd           Cancellationof shares held by a    
                                            family trust, of which The Hon C W 
                                            Cayzer is a trustee, following the 
                                            election by the trust to receive   
                                            Caledonia Investments plc's        
                                            Elective Special Dividend.         

9.   Number of shares, debentures or   10.  Percentage of issued class acquired
     financial instruments relating to      (treasury shares of that class     
     shares acquired                        should not be taken into account   
                                            when calculating percentage)       
                                                                               
11.  Number of shares, debentures or   12.  Percentage of issued class disposed
     financial instruments relating to      (treasury shares of that class     
     shares disposed                        should not be taken into account   
                                            when calculating percentage)       
                                                                               
     8,000                                  0.01%                              
                                                                               
13.  Price per share or value of       14.  Date and place of transaction      
     transaction                                                               
                                                                               
     1902.17 p                              13 July 2006, London               
                                                                               
15.  Total holding following           16.  Date issuer informed of transaction
     notification and total percentage                                         
     holding following notification                                            
     (any treasury shares should not                                           
     be taken into account when                                                
     calculating percentage)                                                   
                                                                               
     Beneficial: 90,730 shares 0.15%        17 July 2006                       
                                                                               
     Non-beneficial: 83,759 shares                                             
     0.14%                                                                     
                                                                               
     Options: 90,908 shares                                                    
                                                                               
     Deferred Bonus Plan: 4,552 shares                                         

If a person discharging managerial responsibilities has been granted options by
the issuer complete the following boxes

17   Date of grant                     18.  Period during which or date on    
                                            which it can be exercised         
                                                                              
19.  Total amount paid (if any) for    20.  Description of shares or          
     grant of the option                    debentures involved (class and    
                                            number)                           
                                                                              
21.  Exercise price (if fixed at time  22.  Total number of shares or         
     of grant) or indication that           debentures over which options held
     price is to be fixed at the time       following notification            
     of exercise                                                              
                                                                              

23.  Any additional information        24.  Name of contact and telephone     
                                            number for queries                
                                                                              
     Another director of Caledonia          Mrs E J Osborn                    
     Investments plc, Mr W P Wyatt, is                                        
     also a trustee of the trust            0207 802 8080                     
     referred to in 8 above, in which                                         
     he and his children are                                                  
     beneficiaries. Mr Wyatt has                                              
     therefore also notified the                                              
     company of a beneficial interest                                         
     in the shares disposed of by the                                         
     trust.                                                                   

Name and signature of duly authorised officer of issuer responsible for making 
notification                                                                   
                                                                               
Edith Osborn, Assistant Company Secretary                                      
                                                                               
__________________________________________________________                     
                                                                               
Date of notification ______17 July 2006_____________________________________