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Ann,
Two address's, which  may be able to help.  South African National Museum of Military History.
                                                                     Box 52090 Saxonwold. 2132 Johannesburg.
                                                                                            Plus
                                                                               Chief of Staff Personnel,
                                                                          Director Documentation Service,
                                                                               Archives and Reserves,
                                                                                   Private Bag x289,
                                                                                         Pretoria,
                                                                                           0001
                                                                                         

Anne.
The band on Tim's left cuff, is a duty band worn only when duty,usually blue and white,or red and white.
The  letter and numeral on the collar,is division and warrant number.
The helmet plate,is open crown in white metal ,with  Johannesburg Police in the circle,and in the centre E.R. cypher for Edward Rex.
                                                                                                                          John. 

All medal's awarded by the sovereign  in His or Her name ,would be displayed on service dress, by a ribbon bar unless otherwise instructed to wear actual  medal's in full dress or on parade.
The King's South Africa Medal, i,believe was never issued with out the Queen's medal and was awarded to all personnel engaged in operations in South Africa in 1901-02,so the medal on Kennedy's breast may well be the visit to Ireland 1903.
 The only medal's given in his paper's would normally be for the ,Constabulary medal,or King's police medal ,and then not all way's

 Ann,
On taking a close look at your photo taken at the Curragh camp, i  can see he is wearing the 1900 visit medal where one can just make out the the suspension brooch of shamrocks.
After seeing his service paper's, and by them, that he was awarded the Queen's South Africa medal,with two bar's or clasp's,Cap colony,& South africa 1902  so in conclusion, the medal bar worn in the police photograph is probably by the look of it, the Q.S.A.medal.