Transaction in Own Shares

Caledonia Investments plc

Transaction in own shares

Caledonia Investments plc ("Caledonia") announces that on 10 May 2012 it purchased from J.P. Morgan Securities Ltd. 10,000 of its own ordinary shares of 5p each at an average price of 1342.00 pence per share. The purchased shares will be cancelled.

Following the above purchase of shares, Caledonia's issued share capital includes 57,286,301 ordinary shares of 5p each with voting rights.

For further information, please contact:

Graeme P Denison

Company Secretary

Caledonia Investments plc

Telephone +44 20 7802 8080

10 May 2012

END