There are a number of Canadian stations that license and air programming from British and French networks. In addition, PBS and TVO air a lot of British programming. It's not difficult to find. It's also possible to stream British and French programming and stations over the internet though many stations are geo-blocked.
Since the rights to much of the British and French programming worth watching is licensed by Canadian broadcasters, the carriage of originating channels is untenable. I'm not sure most people would want to pay the high cost of other ethnic channels for stations from the UK or French channels either.
SuperChannel once carried a few Australian shows and, as noted, I've seen some on CBC the last couple of years.