The programme you are interested in was called "The Mounties", and was broadcast on a Tuesday Night at 8.30. It ran to least three series,of 6 episodes, and each episode lasted 30 mins. The theme was about the training of a number of rookie constables and their adventures during their early days as Mounties. The only character I can recall was a former travelling salesman, always refered to as " the man with the Gladstone bag", does this ring any bells. I think the theme tune was similar to Allouette, overidden with galloping horses and jingling harnesses. From memory I would place the year of broadcast as 1950-1952, certainly no later.
About the same time, again at 8.30, Jack Hawkins played the main character in a sea going serial " The Windjammers" about rounding the Horn during the 1860's in tea clippers, any one remember this programme?
Other programmes in this time slot were Adventures of Capt.Hornblower,and my personal favourite Paul Temple, I still get a warm feeling if I hear " Coronation Scot" the theme tune.
Hope this info is of interest and has stirred some other memories of the Golden Days of Radio.